Ratsnakes and climbing...

[Tigergenesis]

I've been under the impression that ratsnakes love to climb. I plan to get a corn, but would love to get some other rats as well. Only problem is, due to space I only plan on having one display tank for the corn. Any other snakes I get will be in a rack, and I feel guilty putting a snake that likes/needs to climb in a rack. That's why I've been planning on keeping sand boas, a rosy and hognose in my rack. But I thought I'd check and see if my thinking is correct: do all ratsnakes like to climb like I think? Are there any that are more terrestrial (or even burrowers)?

Thanks!