Actually, they won't fit. The ceiling is coved and there's only about 6 inches above the trim before it starts to curve. I'm not really fond of having the surrounds that high up, anyway. In the red room pics, you can see the surrounds mounted above the panels. The panels are 6' tall and I found that to be a little high for my taste.
The way I see it, I have 3 options. 1. Mount the surrounds 90 degrees from each other, one on the back wall and one on the side wall as in the red room pics (not ideal). 2 Mount one on the side wall and one actually on the front door itself (not ideal). 3 Re-purpose the Ventriloquist system from the bedroom and mount two of them on the side walls near the ceiling as side surrounds and 3 on the back wall as rear surrounds, using the unique matrixing feature of the Ventriloquist's 6th speaker for center rear surround. This would be a little different, providing an 8.2 channel system.
I really don't know what do do, so in the meantime I have a unique 3.2 system going on.
Sheep,
Thanks for the (tastefully edited) comment. Being in the main living room, this system gets used at least 12-14 hours per day. It's a decided improvement over the Bose 3-2-1 that used to sit in that location.