Firstly, your names wrong if you now have a JK
I have a 2015 with the NSA breakaway cable. The box is just screwed to the side of the frame, the cable hangs under the bumper when in use and is tied up out of the way when not in use.
I'm not worried about the breakaway cable causing damage, I think by the time it's activated the Jeep is rolling on it's own anyway so it's a write-off. I'm just trying to stop it doing anymore damage
Steve