Hi @lboyer1, welcome to the Sonos Community!
With Sonos speakers, you can group them together to have your speakers play the same audio in sync with each other. If you were to go with multiple speakers, you’ll be able to group them in the Sonos app without worrying about overlapping sound or synchronization issues. You can also stereo pair two speakers of the same model, however if they are quite far apart grouping would be the better option.
From looking at the image, I would suggest placing speakers along the two longest walls or in one of those three corners, so one in the corner behind the two white couches and the other on or next to the cabinet next to the table. You can always move the speakers to different locations to test what sounds best to you, but those would be where I suggest. The choice of speaker is really up to you, as you may be looking for certain features, but I think either two Era 300s or two Sonos Fives will be enough coverage for this room. You can compare their differences on our speaker comparison page.
If you have the option, using a Sonos Amp with two in-ceiling speakers will give you the sound coverage you’re looking for without having to worry about placement, as you would install these in the middle of the ceiling near the setting areas. You can also enable dual-mono mode on the Sonos Amp so the ceiling speakers play both audio channels rather than the left and right channel independently.
If you need more information, you can always reach out to our sales team who can discuss speaker placement with floor plans, as well as provide a price quote or invoice for you.
I hope this helps!