The 1152 is larger than the 1122s, with a 15" woofer and a larger horn. From what I understand, it's designed to be installed either way.
As far as the mids and lows, that's why I was thinking about using the 1122s as fills vs the much smaller sx80s. While we are talking about low end, we also have an xi-1191 18" subwoofer we could install, along with the equipment for the hi-pass...
Just for argument sake
The horn in the 1152 is rated for 60x40.
It looks to have a flare width of about 12".
So using the "basic Keele math" the 40* pattern would be good down to about 2Khz and the 60* pattern good to about 1400Hz.
So below that-the pattern will start to become wider and wider.
So consider that "flipping the horn" will only affect the freq above 2Khz