Any experience or thoughts on mounting a Schroth four-point harness in a Limited coupe for track days?

I know our type of one-piece seat is not recommended, but I thing the partition keeps this from being a problem (the belts will not slide down off your shoulders). I was thinking of the three, mounting the shoulder harness at the back of the trunk floor area with the appropriate gusset/reinforcement plate.

Don't really want the inertia reel type set up.