I have thought of a more versatile system if the mice really become a huge issue, but hopefully I can find how they're coming in, and these will only stay there as a precaution.
I've thought of a piece of pvc pipe that they can go in and end up falling straight down passing through some electrodes that instantly electrocute it then it would fall in a bucket in the basement. Could have a switch of some sort it passes by to then trigger the alarm but more than one could go through per alarm set.
Originally I did have a camera and light up there but it having to have both of those always powered on was not really as efficient as a simple notification system. I could easily go all out with a web cam and stuff but this was just simpler.