Set up wall with a middle mark, the two on the side of the wall should be a few steps over and back, preventing a upfield throw.
if the disc is swung to the side, that person closest to that side takes mark, and the rest force toward the middle.
If the disc is swung to the other side, the other side of the wall takes mark and the others force the disc back to the middle
If one any of the Offensive player come toward the middle of the wall, the middle person "middle middle" will guard them and cut them off from getting in the middle of the wall
If someone tries to go up the sidelines, the person on the side "wings" will cut off that person when the disc is on that side of the field.
If someone tries to go deep, the "monster" or "deep deep" runs with them to take away the deep throw.
If two people go, the "monster" or "deep deep" picks who they think is the bigger threat. More than likely the one closer to the end zone.