The development of software is, unfortunately, slowly but on a good way.
I bought two speakers, but neither at Radio even when streaming music can I listen to stereo.
What's important for me:
2. Assigned IP address manually
3. Direct access via the USB port, if possible
Please have a look at the Sonos speakers.
I hope the stereo pairing coming soon next months.
Merry x-mas and a happy new Year