My bracket is effectively a strip of angle and with the 'P' clips lower down on the vertical (not quite vertical due to the angle of the brackets) so that the bolts are at the bottom, the top is then cut away between the frame mounts to reduce weight but as it's made from IIRC 1.6mm stainless sheet it's fairly light yet (due to the 90 degree bend) plenty strong enough.
Not the best pics but;
But, yes a strip of CF angle might be a future project...
