Hi!
For my two bunny condos, I stapled the mesh inside the border of the bottom floor by about an inch, so my girls couldn’t get a mouth around any outside edges. For the flooring, I used stick on “hardwood” panels. I’m not sure how your cage is constructed, but I also had issues with my Princess chewing the sheet vinyl that was under her cage when we first got her. It might just be something they’re interested in chewing, whereas I have found the the faux hardwood panels doesn’t interest them at all and are very inexpensive. Also, I have stapled each strip down with a few staples at its edges so that if they would manage to get one up, they wouldn’t be able to get much of it at all and the adhesive won’t be an issue. I’ve heard a few people say that staples are unsafe, and obviously they are when they’re unstapled. But, I’m an adult man and I can’t pull one from wood without significant effort, so I doubt a bun could either. Staple guns/basic staples are less than 10 bucks total at your local hardware giant. Hope this helps!