Generally you're not supposed to peel them off and reuse them. However, I know someone who did once and she doesn't have issues with it.
What I do with my mats, is pout the sticky side down on a sheet of tin foil, trim it up and just tape it to the bottom of the tub. Makes it super easy to switch to bigger tubs later.
You could do this and I'm sure it'd be fine. Just monitor temps closely for the first few days to make sure they're stable.
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