I can only assume those would be Soundbars I know if the TV is playing you can send that audio from said TV everywhere else. Ive never tried casting audio to a speaker though. There used to be a way to play your library natively through the sonos app & then they got rid of it & my mom was fairly upset about it. My workaround was to basically use one of the TV’s like an AUX Cable but this is much easier.
I’ve had a pair of Play 1s for years, and if you stereo pair/group them in the Sonos app and play to the master speaker (the one you initiated the pair/group from in the Sonos app) from a UPnP capable control point they’ll play in sync.
There are restrictions on grouping different generations of speakers, but if Sonos can pair them then you can play to them via UPnP/Symfonium.