Mites are not the worst thing that can happen when you introduce a new snake. An infectious disease is very hard to spot in reptiles and can take your entire collection. Do the best you can, a separate room ,across the room, separate enclosure but be very diligent with cleaning everything including yourself in between contact with the quarantined animals and the rest of your collection . Maybe a friend wouldn't mind taking care of your new snake for a while while its in quarantine.
