I would suggest waiting 6 weeks before doing EMSculpt in the same area so that most of the inflammation and swelling is gone and your tissue is more receptive.
Diastasis is a weakening of the abominable muscles that can lead to an unsightly bulge. It is common after pregnancy, large weight fluctuations and aging. EmSculpt is a high frequency electromagnetic that causes a supramaximal (more than you can do on your own) muscle contraction. Four sessions...
It is much more comfortable and preferred to be lying on your back. The Edge applicators have the RF and electromagnetics on both sides of the dual paddle, so it does not matter as this will target both flank areas towards the front and back sides.