I put my chewers in a tank. I know I know, everyone says "Tanks are bad for rats!" but so far they haven't had any issues, and they can't chew glass. They have chewed the sealant out of the corners! They are near a fan, so the air has good circulation, even down in the tank.
All chewers seem to just CHEW, and they'll chew tubs, cages, you name it. Unless you've got a metal bar cage with a metal pan, they'll chew out. (or glass, heh heh)