I'm not keen on rats either WW. Ashamed to say we used to put down bait in the greenhouse because that was where the indoor hutches/winter quarters were for the small furries (when we had some). One rat had started gnawing its way into the hutch to get the food
. The guinea pigs sometimes had a mouse living with them and didn't seem to mind but one day it must have started to squeeze through the mesh and changed its mind but didn't get its back end free before setting off in the opposite direction. Felt really sorry for the poor little sod which was, of course, dead when i found it in the morning. Had to cut its corpse free
No good being a wuss if you're a single parent and live in the country.