RHP is simply not going to get the floor level of a 2’ tall enclosure to 90°, especially under a hide, without cooking the rest of the enclosure. I’ve got 5 set up the same in a room heated to 77-80° and the warm side floor hides get to about 82-83° inside the hide. Shelves and perches are set to reach 87-90° and the critters go there is they want more warmth
Yup, that's where we're at. Right now we have a UTH on glass. Are you in PVC? I guess that's my next search - understanding the PVC and UTH temps. I'm still concerned about the cheap table top under it...