I've mounted mine on the top of my ARB bumper. I've seen several mounted on custom rear bumpers with swing away tire supports. I'm not sure there is a proper, or factory method. If you look through the mod'ed 70's sticky there are several different mounting methods.
I thought you wanted Toyota OEM jack holder.
The Toyota OEM jack is an excellent strong little jack. You only have to lift the axle a few inches to remove a tire. The high lift you have to jack the truck up about a foot, because of all the suspension droop. And when its jacked with the high lift the truck tends to be unstable. The little bottle jacks are quicker and easier to use.