I'm not sure what kind of mount the fass comes with, but the airdog (looks very similar to the fass) I got mounted between the transfer case and fuel tank. The mount clamped on the frame with the pump and filters toward the center of the truck. Looks very clean as you can't even see it unless you look under the truck. Good luck on your install :Thumbup:.
This was originally on the truck before I bought it, it went back for warranty repair, and then I got it. I have it mounted on the driveshaft hoop guard thing I am not crazy about where it is, but it works fine. I am going to change out the hose also, starting to show signs of dry cracking.