I’ve sold a lot of the Sonance VP82R 8" 3way in ceiling speakers powered by the matching DSP amplifiers. I’ve even added their back boxes to help the sound out even more. Now of course, budget wise, this is well above the Monoprice/Sonos combo but its food for thought if you’re looking for a decent in ceiling back ground audio system.
Now, will it sound as good as a traditional in room speakers? No. Architectural speakers aren't design for that anyway. They're meant to be hidden or less obvious.