I just started obsessing over crabs and have 2 who will be upgrading into a 55 gallon soon! I cant stop thinking about the upgrade

So here is my first question.
I'm going to buy the 11 x 47 ultretherm pads but I also was to apply a decorative sticky background thingy.
Will it affect the heat of the tank? Or melt or de-stick it?
I am planning on insulating the pad as well.
I thought I saw someone on here have a background sticker and the UTH but have only seen one person do it.
Please and thank you!