We use lethal traps as much as possible, but if I had a cage trap I wanted to use, zip ties with the screw anchor would be my go to.
Nah, stop putting holes in people's roofs.
Just set two cage traps and counter balance them over the peak if the roof by attaching a long ( as needed) wire to one another.
A trap on one side, one on the other, drape the wire over the peak, pull tight and traps are as stable as can be.
The best animal attractant is : an animal of the same specie
Must I teach you everything ?