Hello @Rasher, welcome to the Sonos Community!
I am currently using a Sonos One and Sonos One SL as surrounds on my Home Theater setup and I am extremely satisfied by the performance.
The latest generation of Sonos speakers equivalent to the Sonos One would be the Sonos Era 100’s.
If you enjoy the Dolby Atmos experience when watching films or series who support the format, then maybe you could give the Sonos Era 300’s a try.
Make sure to purchase directly from Sonos.com, and if you are not satisfied with the outcome you can take advantage of our Return policy.
With my response your thread moved to the top of the latest activity list. Maybe other users would chime in and share their experiences with Sonos Surround Audio.
I hope this helps.