Yes, that's the type I'm referring to. I stick with at least 12 inches, but I personally prefer 18 depending on the species.
http://www.exo-terra.com/en/products...rium_large.php
I was using the 36x18x18 and I've used the 36x18x12. I housed two and three colubrid snakes together(Rufous Beaked Snakes). I wouldn't keep just any snakes together because of cannibalism, but I know from experience with the snakes I have it's fine. I just take them out and feed them in separate enclosures. If you need to raise the humidity then you can cover the other screen sections but overall if you use a glass tank, then exo terra is the only viable option IMO.
If the snakes are smaller, you can just crowd the tank so you're not buying a small tank now then a larger one later. That's what I did.