I don't know from experience, but I've heard that Dr Orlando Cerpa in TJ does amazing work and offers liposculpture to the hips and cohesive gel booty implants.
Cardenas in Guadalajara can do the same exact procedure but also offers a cohesive gel hip implant option under the TFL if there is not enough fat to graft. But yeah, I have not seen any before/afters of his work.
I'm really interested in this, too. I worry that I wouldn't have enough fat to graft but I much prefer this method as it's a non surgical approach. I still haven't gotten around to sending either one of these surgeons pictures, but I've kind of chilled out on the idea until I give HRT + exercise at least several months to see if I can just be happy with going all-naturale.
Also there is a newer tech called Vaser that is less invasive than a lipo canula, but I haven't done much research on it and I've heard it's really expensive.