So I'm setting up a tub for my new boa. To heat it, this is my plan:
Tub
Foil
UTH
Reflectix

Now my question is, is it safe to do this? I don't want to attach the uth directly to the tub, since it says don't attach to plastic. I also want to tape the uth to the foil, so that it won't be attached directly to it (I'm leaving the covering on the adhesive side). Will this damage the uth? I got the foil idea from someone else's tank setup on here. The reflectix serves 2 purposes, to redirect heat, so I don't have to turn the uths as high, and to insulate the heat pads from the floor, since the tub will have to be resting on carpeting. Do I need air space around the uths? The directions say don't form heat pockets. Here is a mock up picture:


And the reflectix with my homemade rheostats:


Thanks!
-Eric aka "twometal"