Advice on a group setup

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Hey,

Just on the off chance someone can hep :)

I'm trying to build an audio system in a big L-shaped room (kitchen-diner-lounge) that I can use to watch TV (sound via HDMI or optical) or cast music to when the TV is on standby.

Given the shape of the room, it would be ideal to have a sound bar in front of the TV, and 2 360 degree speakers in other positions in the room, the 2 others can't be "rear" channel, as it would sound really ropey near them!

Does anyone know if the grouping (e.g. MagniFI Max soundbar can be grouped with 2 standalone speakers like S2 in full audio mode? can I cast to them as a group, from within chromecast enabled apps like Spotify, iplayer radio, plex etc, or does it have to be via the polk app?

thanks! Any advice gratefully received. working it out from the product info is damn near impossible!

James