4-Point Rollbar Placement for EB

[UTFLIWGYA]

All: I have acquired a Tom's Bronco Parts 4-Point Rollbar that I plan on installing in my EB. It is a bolt-together version as depicted in the picture below. I am having it welded together then I'll install it.

My question is: What measurements should I take into consideration when locating the best (strongest, preferred) area to mount (drill, bore holes into the floorpan) when I put this thing in...closer to the front seats...closer to the tailgate?

Thanx, Brian