I am setting up a new tub and am wondering if I can avoid sticking the UTH to the tub because then I can't ever take it off. I'm thinking just cover the sticky side of the UTH with foil tape. Then I can tape the UTH to the tub around the edges. It is a large UTH and I'm sort of worried over time and with the thermostat probe it might start sagging in the middle. Anyone have experience with this?