I have a question about the mounting points...the lap part is pretty obvious as to where you stick those, but what about the shoulder part? My car came with a Sabelt setup which bolts behind the rear seat - but then you lose that seat in terms of seating capacity. Is it possible to mount the shoulder bolts closer, like at the back of the rear passenger footwell? This will increase the break angle of the shoulder belts from about 90 degrees to 150-160 degrees. Can't do the physics in my head - will such a mounting position seriously compromise the strength of the rear bolts?