Best answer by Dwayne82
I'm also living in Switzerland. If you look closer, most of the sellers don't advertise the Alexa-functionality (they only mention the integrated microphones).
Nevertheless you can set up Alexa in Switzerland in the following three steps:
1. In the settings of your Sonos-app, change the Country of your account to Germany (or another Alexa-friendly State like USA/UK/AT...)
2. Go to alexa.amazon.com and create an account. (use the same country as above)
3. In the settings of your Sonos-app, connect the voice-service with your amazon account.
You can't set your location in Switzerland for weather-forecast or other services.
You have to configure Alexa trough the Alexa-webpage because you can't get the app in the CH-Appstore/Playstore.