Above my bed, I hear mice (I think). Luckily I have a walk up attic. Today, I took my circular saw and cut a plywood strip about 2 feet wide and about 8 feet long to expose the joist cavity. I did see rice sized dropping on top and below the insulation, so from internet research, it appears I have some mice. Question, do the mice traps go on top or below the insulation? Not knowing better, I pulled back some insulation and tucked it under the plywood exposing the top of the sheetrock ceiling and put the traps there. Is this OK? Should I lay the insulation back down? By the way, these snap traps are a royal PITA to set. Everytime I placed it on the ceiling, they would activate. I actually had to take a salad tong and use that to carefully place into the joist area. Did not tell my wife though.