I mount mine across the back behind the roll bar, strapped down. It serves two purposes for me, the occasional actual need for this type of jack and to hold my crap down in the back when I tip the jeep over. I have a sub woofer, 12 volt air compressor, strap, shackles and D rings in the back. Everything is packed in a way that the can't fall out when I lay my jeep over. I have tested this 3 times (just laid over on the side) to date and have lost nothing out of the back.
01 TJ, 34 Super Swaper 34x10.5 bias, Winch, locked, belly up, some armor, 4.0, 5spd