There is a smartapps that lets you use multiple DLNA speakers at the same time. I think you need to update the Sonos device type though. I don’t know how synchronized music will play… Maybe worth a try…!
This is the release form Radio Tunes Stations, Now your house can welcome you with a good music from Radio Tunes, More than 200 Radio station , sure one will be your favorite.
This smartApp allows you to set some event and hear a message, sound, a track previously played and of course a station From Radio Tunes, Jazz Radio, Rock Radio, Digitally Imported.
Radio Tunes, Jazz Radio, Rock Radio, Digitally Imported (Before SkyFm) have more than 200 stations and its free, you must to sing up to get the key to allow smartthings to play.
Example Radio Stations : Alternative Rock,Ambient,American Songbook,Baroque Period,Bebop Jazz,Best of the 60’s,Best of the 80’s,Blues Rock,Bossa Nova,Café de Paris,Chillout,Classic Hip-Hop,Classic Motown,Classic Rock,Classical Guitar,Classical Period,Classical …