Put it on the top of the frame rail where the original would have been mounted on a car with the split brake system. Full pressure from the master cylinder will insure you get an accurate adjustment before the brake fluid transits a bunch of twists, turns and connectors. Note that on some racing applications a pressure reducer was employed usually to limit rear axle braking, that is the only instance that I am aware of where the unit would have been mounted at the rear of the vehicle. Getting the rear brakes on a circle racer right is tricky, too much braking on the rear and the wheels break traction and the car spins out. Too little braking and centrifical force causes the same result. Why did you opt for and adjustable unit? The unit you have pictured looks like a single pass unit, one that will work to only the front or rear brakes on a split system.
