Can't you just forget the rack, buy a large faunarium or something cheap and temporary (& small heat mat) to house your corns individually for the meantime? Surely that's priority, obviously you're having a hard time with landlord, (thats really not fair) but you should separate the snakes, i'm new but from what i've read from tons of different sources is that it's really detrimental to your snakes well-being, (reducing life-span, causing stress - leading to all sorts of illness, cannibalism - no matter how many cases have been reported it aint really worth the risk is it? & early breeding to name but a few), Just think about it