On to room dimensions. There are two rooms I would be able to place speakers in. The dimensions (W x H x D) for the first room are 12x8x18(Feet). The second is 10.5x6.5x20. Neither of these rooms are closed off both are adjacent to other rooms/areas of the house. I just measured room boundaries for the sake of simplicity.Couple of comments. I'm assuming the second room isn't really only 6.5 feet in height. If so, I would avoid that room. Additionally, you should avoid rooms that have dimensions that are multiples of each other. If you stated things correctly, the depth of the second room is roughly twice the length. Not ideal for acoustics. The first room has ideal dimensions acoustically and should allow for sufficient placement of planners that need to be well off the rear wall.
J.Chip