I have for sale/trade a dozen custom (never used) Victor "Survivalist" Rat Traps. They are custom painted camouflage, with a skillfully drilled 3/16" hole for attaching 550 parachute cord. The design is fully tested and works for Ermine/Weasel, & Tree Rats.
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I have never used poison baits as I didn't want a rodent dying in a place I couldn't reach and stinking for a long time...
I used Victor brand traps with the plastic bait paddle trigger.. I modified the traps with brad nails sticking up near where the kill bar closes on the trap base to assure a rodent CAN NOT escape.. Also the string tie down is a must as one varmint will carry away your trap to consume the varmint in the trap.. I also used this modification system on Victor brand mouse traps to good success...
I never had trouble with rats, or chipmunks but caught many red squirrels doing damage in and around buildings.. I caught about 20 or so ermine, long tail weasel all in the vestibule of our chicken house.. Unfortunately still loosing many chickens in the process...
I built a bottomless box with a 2" entrance hole to cover a trap set in with the chickens.. Be sure to put a cement block on the box heavy enough the chickens can't turn the trap cover box over exposing the trap..
My Main Coon cat, all 10+kilo of him would not bother getting off the couch to catch a mouse let alone go outside...