If you have problems with predators digging under the side wall, you can run a low (3 or 4 inches off the ground) electric fence wire around the OUTSIDE of the coop. Then locate the coop near a HOT electric cattle fence and run a wire with handle to the fence. Then move the coop up and down along the fence, each time re-attaching to the electric fence. Once the predators get zapped a few times they will learn to stay away. If you worry about climbing predators, alternate ground (if the cage does not ground) and hot every few inches up the side and over the top. Zap them f'ers.
I don't want to kill the weasels as they are my best barn mousers. So far so good.