Under tank heaters

I got a couple of tanks recently and the UTH's were stuck on the side. I was actually able to peel them off to problem, they didn't even leave any residue.
However I have bigger/higher end UTHs I plan to use. Since these old ones peeled off so easy, is there any way I can store them and have them keep their stick? Can I use seran wrap or something?
Thanks!

You can put foil heat tape on them (sticky side to sticky side) and they become completely reusable and mobile. You'd just secure the UTH to the bottom of the tank using some other method going forward.