Just spend the $13 and get one of these, they work great. Ours is 15 years old.
https://www.rona.ca/en/product/wap-a...t-trap-1309016
In my experience if you notice lots around, you have a nest somewhere nearby. Use the foaming spray once you find it. Follow them around, you should see them sneeking in a hole somewhere, or up in a tree.