If you use an L bracket, it mounts quite nicely to the roll bar mount, is upright, and wont crowd the filler bracketry.
Sascha Steinway TLCA # 20217
1977 FJ40 "Ripper" (because it shreads!)
1988 FJ62 "Dino" OME, now in the hands of my daughter
2013 F-150 "Black Ops"