Doing squats is great for your glutes but you can do a whole lot more to push your lower body harder. The Titan Fitness Plate-Loaded Kickback Glute Machine is worth a look. It has a 2-sleeve plate loaded system for Olympic weights. It comes with chest and arm padding (foam) to keep you comfortable.
This exercise machine has max weight capacity of 330lbs. It has a footprint of 39 x 68 x 66.5″.