You can put the Symfonisk lamps in the same physical room if you wish, but not in the same Sonos room if you have bonded the Play:1’s to the Playbar, as two surrounds are the limit. You would have to unbond the Play:1’s before adding the symfonisk speakers into the HT setup.

Nothing stopping you however have additional speakers in the same (actual) room in the home, either ‘standalone’ or as a ‘stereo pair’. The speakers can all group together too for music playback in perfect sync.

You may likely find though, a slight audio (lip-sync) delay if grouping all for TV audio playback, but there are tools in the App, like ‘TV Dialog Sync" which may help in some cases to bring some TV stereo audio playback into sync.

I use other speakers alongside my HT setup, from time to time, but mostly I use them all together for music playback.