I'm thinking of putting in-ceiling speakers in parts of my house, possibly going back to a multi-room amp in my hall closet.

One thing I'm pondering is whether I should install two speakers (one for the left channel and one for right) or one stereo speaker. From what I understand, stereo speakers are usually used in small rooms like bathrooms or walk-in closets. But I'm also wondering why I would need - or even want - stereo separation in places like a kitchen or dining area. I suppose it won't matter if my source can output a mono signal, but I'm looking at Sonos Connects for inputs, and I don't think they can do that...

So what would you folks suggest?
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Matt