You are forcing you BP to choose either security or heat. This is against most (all) methods anyone else uses I have ever known. The hides are always recommended on the hot and cool areas. Everyone I know chooses not force a very secretive animal to violate its instinct. So I will rephrase they do not bask in the wild or naturally it is not an instinctual behaviour they are nocturnal.

Go with the RHP, although I would use Epoxy or LP to seal the floor urinates attack paint and becomes difficult to clean. I would still recommend the PVC floor.

Question as a RHP is just a strip of flexwatt in a box, what is the advantage over flexwatt under the floor? Radiant heat is radiant heat either way it has the exact same properties.