RFA and mini maxi anemones can both go on rocks, in the sand if they have substrate to set their foot on or better yet, in PVC end caps set in the sand. I've had a RFA and a mini maxi right next to each other and there was no harm to either. I have 35+ RFA's (lots of babies) and 4 mini maxi's as well.
I don't have an absolute answer to that question, but here is my best guess. North of West Palm, 20% chance of success (and that's probably being generous). At the Clearwater Beach area, 1% chance. I've never seen any around Naples, Ft Myers Beach or Sanibel. Sorry. I'd love to hear that somebody has.
BTW, the Ultra RFA's come from deeper water, like 30' or deeper. The shallow water ones are still interesting and some may have some color and cool patterns in off white, brown and black.
Thanks, it only took 2 years to make and grow out... Oh, and 15 years of experience in the hobby! But in reality, it wouldn't be hard to duplicate. And as cool as you think it looks in the photo, It's WAY cooler at night (no light in from the windows) with the house lights out and just the blue leds on! Some say it lights up like a 1960 hippi poster under a black light. If that's before your time, others say it look like the jungle on Pandora (the movie Avatar) when K. Reeves was running around lighting everything up! I just keep looking for corals that fluoresce well under blue leds.