Ok I am still new at this as well so any of you people correct me if wrong. Are you using an aquarium set up I am guessing? I had my CHE straight on top of my mesh with a dome cover that way snakey couldn't reach it. only thing you have to watch out for is how hot surfaces in there might get. like my ambient got into the high 70 low 80s range but the CHEs they make objects like hides hotter so my hide itself was in the 90s...crazy I know.

as far as the sizes of the hides my bp who is close to the 200s yea he's a baby still lol, he still finds the mediums kind of big so I took two ends of a nutrigrain "i think" cardboard box cut them low and made a small hole so that he had a more tight hide that he could enjoy.