[Dr K]

Interestingly, my Schroth was a little different. For the 5-point (single) sub anchor, it suggested mounting it a little in front of the cam lock (different from the pictures above), but for the 6-point (double) sub anchors, suggested a little behind the cam lock similar to the pictures above.

But I wouldn't mount it to that seat frame - looks like it might cut into the belt, and would likely be at the wrong angle. Mount it properly--your life could depend on it (or maybe just your manhood).