:2 sets of overheads can easily cover 10 feet without the need of a TM.
while all of this this is almost too much, there's some wisdom is "softly, softly catchee monkey" and "less might be more" (blasphemy!?!)
anyway it took me a bit of plundering of current resources to put up (matching paint, of course) these SLX's as TM, not yet wired up
wrt ron's statement, FTR my tops are 7' CTC front to rear and side to side. the Volt 6's replaced the SLX set and as of yet have been heard by other ears and I welcome any locals ,mol, to make it a point to show up. I have some ATMOS BD's.
so these TM's measure about 42" CTC spacing wrt TF and TR.
The down angle is pretty much a cross fire wrt MLP but that's wiggle room for improvement.
It's kinda hot to be in the attic wrt wiring but in sending out a big K.I.S.S., to the Scatmos process, I'll be using an Onkyo 260 and the 818 for the time being.
The angle lumber hanging up there is for 6" Roxul clouds for each speaker, another work in progress . .
as the pics show, Yep! , that's 'nother speaker up there.
keep it coming . . .