Ring Retrofit Kit - screwing it into the wall

Hi guys, So, I had my retrofit kit installed. I was trying to get the cover off, used a little too much force, and separated it from the wall. Now I can't use the double sided sticky stuff to keep it attached to the wall. I want to put in anchors in the wall and screw the retrofit kit into place on the wall. What size screws/anchors should be used for the retrofit kit? I really do wish it came with them. Thank you.