Well, as others have said, mites might be the least of your issues bringing new snakes into your current reptile room.
I'd at least setup a couple of stand-alone tub enclosures on the opposite side of that room with a UTH for hot spot. Nix, Rid, or PAM- treat the enclosures and let dry very very well. You can also use food-grade DE around the enclosure (outside on floor, etc) to kill any mites that crawl. Gloves, and working with that bin last would be good precautions.
Reptile spray by natural chemistry is a good spray to use on snakes, but they should not be soaked and water should not be given for 24 hrs. after treating.
I always treat enclosures for mites when expecting new snakes and have a quarantine setup ready to go. I went through a horrible mite infestation a few years back and don't want to repeat that.