Just used self tapping screws to the rear floorpan. It does take up some space. But with a four door, i still have plenty of room. I used two by's to mount the brackets to to raise ii up right.

2001 Sportage, 4" RSG lift, Cragers W/31 10.5 Micky Claws, Warn Manual Hubs, 16 gallon Pro Street Fuel Cell, Custom Snorkel, K&N Filter.
1989 Dodge W250.