When I worked in a pet store years ago, this is what we suggested to snake owners whose snakes escaped and were running willy nilly in the house: glue boards. They work like a charm. Lay them about, put the bait on the center of the trap and check daily. The snakes can't free themselves and will be stuck fast. If you want to relocate them, douse them in veg or olive oil and they'll come off the trap. If not, well, you know. For larger snakes, I'd get a piece of plywood or something of large size and considerable weight and nail the traps down to form a large surface. Put the bait in the center and leave it in the snakes' path. Good luck!