Well, I live in a small apartment AND I have multiple snakes in QT right now...so I think I can give some answers. And yes, I even have a snake that came in with mites, so that area is covered here as well.

I currently have 5 snakes in QT: 1 corn, the MBK, and 3 BPs. The two young BPs came in about a week apart from reliable sources, so they are both in the spare room/office. The corn and MBK, which I QT for only 1 month instead of 3, are in the living room in a nice cozy corner. The third BP, an adult male who came in with mites, is on the other side of the living room as far from the office, and especially the bedroom(snake room) as possible.

Yes, this means I have tubs and thermostats all over the place... but I also have very healthy snakes. The mites were a light case and gone now, and everyone eats well (when they aren't in shed).

The key is to get them as far from others as you can. Oh, and each snake I mentioned is in their own enclosure. The two office BPs are in 10g tanks and the others are in individual tubs. And if you were wondering, I have about 5 spare thermostats for just such an occasion. Best to be prepared.