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Correx is a kind of corrugated plastic you can buy in sheets from diy shops or online.
I'm tending to think he needs an area to play in without you in it, you can still interact with him while in a card/correx play pen without this big human getting in his way while he explores! That's not so easy just on the floor without something to contain him & bathrooms often do have hidden ham size gaps so do a really, really thorough check if you do that.