The only issue with adding more points of attachment is that in order to do so, you will need to drill into the torsion beam. Which if I am not mistaken will weaken the torsion beam and cause failure. I had thought of a hand way of using a U shaped brack that does not require any drilling but it will need to BOLT clamp like a C-clamp does. or just have brackets welded to the torsion beam(more costly) but it would be stiffer and better for track day driving!