You can find them drowned in the water bowl.
Spray a white paper towel with Reptile Relief and wipe the snake with it every 3 days. The Reptile Relief is a solution of salts that kills mites by dehydrating them.
Otherwise minimal handling, you definitely want to keep your snake away from your clothes, the cloth couch, etc. while in QT as those will provide hiding places for mites and let them spread to your other snakes.