late to the party
but all the heavy geometry has been done
so you have some options wrt getting a good placement / aiming
hangman cleats, great stuff
by using a full motion mount, a #3411
from monoprice, holds about 55 pounds and has an extended reach
that 88 Special weighs 52- no sag issues
i've been able to get FH's out from the wall in the same vertical plane as the LCR,
postioned over the LR for the same stage width
and still adjust angles slightly more wrt MLP
for some bookshelves I add an angled block to the back of the cab and then the hangman.
when I have an angle range to work with . .
I may get better (?) results