Just sweep with your hand the dirt mound to the side. There will be a hole, pull it apart with your hands till ya got enough room to place the trap and tell if it’s a straight run and not a intersection, I have trapped em in a intersection, but ya gotta remove a lot more sod and set 3-4 traps or however many tunnels ya got.

Ping pong balls for the win.
Once you've wrestled everything else in life is easy. Dan Gable
I keep my circle small, I’d rather have 4 quarters than 100 pennies.

Ain’t easy havin pals.