Are HIFU and radio frequency safe to use after umbilical hernia repair and recent pregnancy?

I had an umbilical hernia repair July 2021. This was completed without mesh and using stitch only. I have some slight loose skin on my belly following two pregnancies. I was looking at getting HIFU and radio frequency on my stomach. Are there any issues getting this post umbilical hernia repair? Ie; can it dissolve the stitches somehow? Also, should you wait until you are back to desired weight post pregnancy? I’m 7 weeks post partum. I’m 37, non smoker, have always been a normal weight.