Multi-room possibilities with D0S 2

[Olivier4444]

Hi

Since there is no more multi room with DOS 2, I'm desperately looking for a way to send music on my 3 golds.

I have tried with ROON and it worked great with the 2.8.5 firmware but not with 2.9.0 (synchronization issue).

I suspect Airplay to have a problem with 2.9.0

I was thinking about using Chromecast Audio ? 
I could have 2 golds paired (L+R) with one of them connected with Chromecast via Optical.
And another gold by itself also connected to Chromecast via Optical.

Has anyone tried this ?

Thanks in advance for you help.