I wouldn't drill the holes and put down the screw unless you are using paper substrate. If you plan to use anything to hold humidity, your snake will push the stuff around. My BP shoves substrate all over when she is out playing. Plus I don't know about your snakes but mine had a habit of trying to poop on the things. I ended up putting them up on the shelf. Now Caesar will knock it down on top of his hides lol. I just cant win with him. The boas leave it alone but the BP will push it off too. It's the dang pythons haha.