When you set your trap in the bed that you have excavated, then you will bed it very firmly, pack the bedding material tightly so that the only thing will move is the pan.
Set the pan tension to hold a 6 inch pliers about, before firing, when you adjust that, obviously do that before you start.
Shift some dirt or bedding material and blend in a bit, maybe use a small stick or rock to steer the foot where you want.
Now you have got me wanting to catch the one that is pooping by my mailbox.