ceiling speaker placement advice

If you want stereo, I don’t think you can get any better than that.  The fact you have two lefts near each other is the key, since you won’t have one channel leaking into the other.  If your areas were different, I’d recommend just going mono, but that layout means stereo can work.

Just a suggestion, I would rotate the dinning table speakers 90 deg clockwise, as you walk from couch to kitchen, the L speakers would remain on left. As kitchen is smallish, scrap the ceiling speaker, and place a Era-100 with voice control/Alexa on counter, control of music with dirty hands, setting timers whilst cooking etc.

 Is this how you think?

Just a suggestion, I would rotate the dinning table speakers 90 deg clockwise, as you walk from couch to kitchen, the L speakers would remain on left.

 Is this how you think?

 

Yes.

One more suggestion…

Since all 4 speakers will be controlled by one Amp you might consider wall mounted volume controls for each pair. Just in case you want lower audio/silence in one area. 

I was thinking to maybe put 6 speakers, so there is a more even sound ‚floor‘ (maybe even mono, I prefer stereo though).
Question again to keep the dining room speakers this way or shift back by 90 degrees (my original)?

I think that you’ll wish there was a speaker in the kitchen. There are dual channel in-wall speakers that play both left and right channels out of a single hole.

I also recommend in-wall Volume controls if multiple speakers are connected to an amplifier.

Something to consider, stereo is not just two speakers playing the left and right channels of a stereo source, it also includes the listener's position. That is a bit restrictive in nature, centered between the speakers, equidistant,  and at a distance that is determined by the speaker separation.

I'd personally wire your speakers, wherever placed, individually back to the Amp location. With the wires all together in that area you can easily (banana plugs work great) try different left/right combinations as well as mono and pick what is best for your ears.

My personal preference for in-ceiling speaker audio is to set them to mono as opposed to stereo. By doing so the listener hears the same sound no matter their position in the space.

IMO in-ceiling speakers are intended to blanket a room with sound and not create a stereo sound stage as with a pair of Sonos Five’s, Era 300’s, Era 100’s or even a pair of in-wall speakers. However, that’s JMHO.

The diagram below shows how I would arrange six (6) in-ceiling speakers driven by one Sonos Amp. The colors represent which speakers would be controlled by the same in-wall volume switch (in addition to the Sonos app).

Sonos Architectural In-ceiling speakers by Sonance come in 6” and 8” diameter. I recommend the 8” diameter for better/more consistent coverage (100 degree axisymmetric vs 90 degree axisymmetric). Read the AI synopsis  below:

100-degree axisymmetric coverage refers to a loudspeaker design where the sound is dispersed in a conical pattern, spreading uniformly at a 100-degree angle on all axes(both horizontal and vertical). 

Unlike conventional loudspeakers that often have different, rectangular coverage patterns (e.g., 90° horizontal x 60° vertical), an axisymmetric speaker distributes sound evenly, meaning the coverage angle is identical regardless of how it is rotated. 

Key Features and Benefits:

• Even Dispersion: Provides a consistent, circular listening experience throughout the room.
• Simplified Aiming: Since the vertical and horizontal patterns are the same, installers only need to consider up/down tilt and side-to-side "pan" to cover an area, making it ideal for ceiling-mounted speakers or surround sound systems.
• Consistent Sound: The sound signature remains consistent even when navigating around the speaker’s coverage area. 

This type of coverage is often found in high-performance ceiling speakers, coaxial loudspeakers (like the QSC 108P), and various professional audio installations where a uniform, wide-dispersion sound is needed. 

Many thanks for your good replies. So maybe going mono and distribute speakers evenly in the whole space…?! i was hoping having ceiling speakers left and right of the sofa, I could also have a proper stereo listening spot.
But I guess, I rather work there with separate, properly focused stereo speakers. 

A second Amp might be what you need, try one and add the second if needed. Flexible wiring will make that easy.

What do you mean by flexible wiring? I have to set the wiring now. Or you mean, already prepare speaker cable left and right in front of the sofa?