I really have a problem with the idea of a Fallout game being set in Miami. As someone who lives in FL (please rescue me), I can tell you that almost every place here is a shithole. It all looks like some random highway exit you pull off at on a road trip because you need to piss (I would say 90% of FL is just shitty gas stations), occasionally cozied right up next to something nice, and I don’t think Miami would be a very fashionable or visually interesting Fallout setting... unless you made it not look like Miami or only focused on very specific areas of Miami.
Also, the majority of FL is below sea level and very swampy. If you drop an atom bomb here, you’re going to end up with hillbilly Atlantis, not some cool post-apocalyptic world.