Can Alexa voice commands switch between overlapping groups of Sonos Amps?

Hi everyone,

I’m planning a whole-home audio system and I’m trying to work out whether Sonos can do exactly what I want before committing to the installation.

My plan is to have six indoor Sonos Amps, each powering four in-ceiling speakers in a different room, plus a garden bar audio zone using a Sonos Port connected to a Denon AVR.

I’ll have an Alexa Echo in each room for voice control. Ideally, I want to be able to say things like:

• “Alexa, shuffle my music inside the flat” — plays through all six indoor Sonos Amp zones.
• “Alexa, play my playlist throughout the entire flat” — plays through all six indoor zones plus the garden bar.
• “Alexa, play music in the bathroom” — plays through the bathroom’s ceiling speakers.

The main thing I’m trying to achieve is switching between these groups entirely by voice, without needing to open the Sonos app every time.

My questions are:

1. Can Alexa target Sonos Amps as playback devices while the Echo devices act as the microphones for voice commands?
2. Can the same Sonos Amps effectively be included in two different Alexa groups, such as “Inside the Flat” and “Entire Flat”, with the garden bar included only in the latter?
3. If I ask Alexa to play music on either group, will the Sonos rooms play in sync?
4. Is there a reliable way to switch between these two overlapping groups using Alexa voice commands, without manually grouping and ungrouping rooms in the Sonos app?
5. Has anyone actually tested this setup, or found a workaround that works reliably?

I understand that Alexa Smart Home groups and Alexa Multi-Room Music groups aren’t necessarily the same thing, and that Sonos has its own grouping system. I’m trying to establish whether there’s a way to make this work reliably with Sonos before I commit to buying six Amps.

AirPlay 2 and phone control are also important to me, so Sonos is still appealing even if I need to use the app as a fallback.

Thanks!