How high is the ceiling? Must they be flush?
I recently was given some wall mount speakers, unknown origin, and then made an amplifier and donated them to The Clay Studio in town. They had 4 inch drivers on each side, and some metal inverse tweeters. They radiate like magic, with a woofer and tweeter on each side of a triangle shape. The woofers where on top on one side, and on bottom on the other.
I don't know anything about them, Signet brand. They aren't expensive. But you can blast 30-50w into them (don't know their ohm). Leonard Cohen will sing for you. Anyway the music fills a much larger space than any home living room I've been in, personally.
What appears more important is that the amplifier and source is good. Once you've got some dispersion with a bit of umph to it, the qualifier becomes whether it's pleasing to the ear or fatiguing. Power conditioning will greatly help. Tubes/Class D will also.
There's no reason you can't bump some loud background music when no one has to talk, and just jam out to some tunes while cooking/cleaning/relaxing. Frankly if it excites you to listen to it, you've won; even if imaging etc isn't perfect. For me this is all about how much I listen, and how well the influence of emotion is brought about. You can have a great deal of talent in something but basically if the timbre in the oscillation of harmonics of different instruments doesn't sing to me like a real one would, I get a bit bored. Imaging, detail, and everything else is a great, fun, benefit but I need hair raising, emotionally deriving sound. That's something I can get at an actual orchestra, but those aren't available every night, in my home. That being said, it can still be achieved in ceiling speakers or any other non-ideal situation. I can still see you having a nice glass of Port and listening to say the
Superwolf album while sitting on your coach with feet up on an ottoman.