I am trying to find a United States doctor who uses the Quanta System's Youlaser MT

I guess the laser does all of the work.  You put absolutely no value on the physician using the laser.  I have a challenge for you.  I will race you to work.  You have to drive an Indy car and I drive the car I drive every day.  While you have the fastest car, you probably don't have much experience driving it.  I'm going to guess that I will beat you in 10 out of 10 attempts.Instead of shopping for a machine, you should shop for a physician with the most experience and excellent reviews in your area.

I will not race you on public roads (this is not sensible nor is it professional- see previous answers). If you want a specific laser, I know that Dr Rox Anderson is well versed in the YouLaser MT. He is in Boston, and he is one of the World's best Specialist. He is not a Physician who decides to buy a laser, he is a dermatologist who INVENTED fractional laser. I did the trials and parameters for Quanta YouLaser MT in 2016- 2017. I treated over 150 cases of acne scarring with this laser, and also used the laser for rejuvenation. The YouLaser is one of the most versatile lasers for rejuvenation and very mild or early scars. The reason why I do not like this laser for moderate to severe scars (Grade 4), is because of the power, - 30 watts. Yes, I do over- ride the system and increase the PD as well as stack the ablative. Not ideal as this leads to prolonged PIH, grids and erythema. Bottom line, its only one of the many Co2 lasers I use- Ideally for acne scarring a high powered short PD is best.  Laser plays a very small role in the management of scars. Scientific papers in 2019 has shown that PRP improves healing time and is associated with greater patient satisfaction rate. There are conflicting studies on the end results. In one paper ablative fractional laser gave superior results compared to microneedling alone, another paper in 2018 showed improved END results with simple needling, combined with PRP compared to needling alone. PRP is most effective in the management of atrophic scars. 
Here are some unbiased points regarding PRP 1. This should be combined with other treatments including laser and or microneedling/ RadioFrequency.2. PRP by itself has little efficacy. 3. PRP best used for atrophic scars. 4. Scars such as box car scars, tethered, rolling and ice pick do not respond well to PRP. 4. Without doubt PRP speeds up healing 5. PRP is only good as adjunctive treatment 6. PRP is HIGHLY dependent on the skill sets of your plastic or dermatological surgeon, as manual subcision is frequently required for the management of associated dermal / subdermal fibrosis. 7. The rules of treating acne scars based upon their merits still applies- see below for more understanding. 
Acne scar revision comprises of many specialised procedures. For the best results, one should target the acne scar type with appropriate treatments METHODS. Using one or two devices is not optimal. As everyone has a unique pattern of acne scarring, the best solution is a tailored one. Remember, scar revision is a medical procedure that is technical to perform. It is not dependent on the clinic, branch, machine, or laser but by the skill of your dermatologist of plastic surgeon. 
Take for example deep ice pick scars, and narrow box car scars. These are best treated with TCA CROSS and focused angled CO2 fractional laser in low density. Deep narrow scars respond better to this treatment than even the most expensive lasers. On the flip side, rolling, and atrophic acne scars can improve with fractional devices such as Fraxel, fractional lasers, ProFractional erbium lasers, Infiini –Intensif –Intracel radiofrequency microneedling. Atrophic scars (depressions) can be treated with either fat graft, PRP or dermal fillers. Tethered and anchored scars are best treated with surgical techniques such as subcision. Other surgical techniques that I use include punch elevation, surgical elevation, punch excision and traditional excision for focal scars. Early and very mild acne scars respond well to eMatrix and non-energy microneedling, as well as vascular lasers. Skin colour changes such as PIH or dark marks respond best to sun protection, creams, and Q switch lasers in the nano and pico pulse durations. 
In the vast majority of patients, different patterns of acne scars will be present. Monomorphic acne scarring (scars of the safe subtype) are extremely rare. Careful examination, especially under angled lighting with scar mapping will give you an understanding of what are the best options for your scars. Additionally tactile examination namely touch will give me an understanding of the amount of subdermal fibrosis, as special equipment is needed for this sub-set of acne scars.  In the majority of patients its finding the correct combinations that yields the best results. It is never about the device, it is about the specialist behind the equipment that will deliver the best outcomes. 
Global leaders in acne scar revision will always use manual methods to revise scars, and employ lasers and energy devices as instruments to assist. All the best, Dr Davin Lim. Acne scar dermatologist specialist. Brisbane, Australia.