As both Airplay and your TT line-in audio do not support Atmos audio and those two audio sources are your intended priority - I would perhaps go with two Era 100’s (stereo paired) rather than an Era 300, as you will not be using its height audio driver - plus two Era 100’s will give better separation for the stereo soundstage.
That’s probably better than a single Sonos Five - which would mostly just provide a narrower soundstage, but noticeable extra bass.
To get the best for the intended use, the Era 100 pair would get my money, but I would later go onto add a sub-mini to the setup a little further down the line.
In truth, I have this setup in my Kitchen/Diner and it sounds great for stereo music audio.
How do I know that my turntable has enough preamp for the ERA100. My LP player is Dual CS 329.
How do I know that my turntable has enough preamp for the ERA100. My LP player is Dual CS 329.
The inputs are all line-level - you can increase/reduce the level (voltage) in the Sonos App. See this link for further information…