You can group all of your Sonos speakers together to play the same audio at the same time. This includes the Amp.

When streaming music, all grouped speakers will play in sync. But when playing TV audio through the Arc Ultra, you will likely experience a slight audio delay from the other grouped speakers. This can create an echo effect if the speakers are in the same room. If they are all in different rooms, the delay will be less of an issue. Also, grouping this many speakers together while playing TV audio can oftentimes create audio dropouts as Sonos speakers are not really designed to be grouped together to play TV audio in multiple rooms. Multi-room streaming is generally used for music in most cases.