What should I look for most when looking for a great body filler clinic?

When I look at the places advertised as "body filler hotspots," the difference in lines seems quite significant.

However, judging solely by photos, it's hard to tell if they're edited or real. Haha.

If I go for a consultation, will they realistically determine the dosage and duration of the results?

Are there any essential things I should check besides reviews when choosing a body filler hotspot?