High intensity focused ultrasound face lift after Gold Thread Lift

I'm 51 years old. I had Gold Thread Lift done on my face 2 years ago in Vietnam. I still look good. But I have some fine wrinkles around my mouth (oral commissure) now. I am thinking about having Ultherapy HIFU lift treatment on my mouth first. If it works, I like to have it done on my whole face. Some source told me that If someone has filling or implanted metal material, not suggest do treatment within 3 months. Is it safe to have HIFU face lift treatment?