Homestead ARB PRO will like you to talk to them so they can inform security that you're there. Further, the farmers surrounding the base will most probably not like you being there and observe you with a drone (as they did when I was there
) as they're afraid of someone stealing their crops. And with those farmers being armed, will not make your life easier trying to evade them.
Locations: SW 320th Street (go to the fence for line up shots) and SW 127th Avenue (for landing, see
https://www.flickr.com/photos/pietertaris/18300400299/) are the places I was at.
Key West's eastern (Shore Drive) and western (crash gate) final approaches can be visited and seen, it's hard to be in a position to frame them right though. On the south end you can visit the threshold of one of the runways (Boca Chica Road), but views there are limited.