Are you making liners that can't be moved? If so, just make the fleece liners so they lay on the floor. Mine will chew it if they can't move them. Some materials are too tempting as well. If your guys chew up fleece liners, try flannel or jean material. You don't have to cover everything in material. Use other things-large dig boxes, large tiles, if it's plastic/metal solid floors leave some open. Cardboard can be used as well and if they chew it, no big deal and it absorbs odors pretty well on it's own. My boys cage has a wire floor at the bottom and they seem to like to move things so they can lay directly on the wire...who knows why...but I can look over and see several tails hanging out the bottom of the cage.
Instead of tradition liners I like play mats too-something that has like already made holes sewed into it here and there that they can crawl into. You can even sew something crinkley into some of the lining if yours like that sort of thing. If mine use the restroom in certain place i put down either a litter box or a deep plastic bin with substrate in it. I make it so everything is easy to yank out at a moments notice as well. Of course now that i've got 15, I need everything as easy as possible to be removed and replaced. I have a group of 7 and a group of 8. The cages have to be cleaned all the way at least twice a week and every day I have to be able to remove and replace things that got yucky in-between. Having a lot of extra's around helps-extra plastic bins, blankets, hammocks, even things like chews and cardboard. If I'm feeling especially motivated I'll cut up a bunch of cardboard into shapes I like to put into the cage at a moments notice.
