Dream Machine Sonos & UPS Configuration

I need two tight-scoped fixes on my Ubiquiti Dream Machine.

1) Sonos One discovery
The speaker is Wi-Fi only, and both it and my phone run on the exact same SSID, yet the Sonos app can’t see the device at all. Everything points to mDNS or other multicast traffic being blocked or mis-routed inside the Dream Machine. I want the network examined, the correct multicast and IGMP settings applied, and proof that the Sonos One reliably appears in the app and stays reachable after reboots.

2) UPS integration
A UPS is already cabled to the Dream Machine but the shutdown script isn’t in place. I’d like the integration configured so that, on power loss, the Dream Machine shuts down gracefully, then comes back up cleanly once power returns.

Deliverables
• Multicast/mDNS settings adjusted and documented
• Sonos One consistently visible in the Sonos app after multiple reboots/tests
• UPS monitoring service installed, auto-shutdown and auto-recovery verified
• Clear notes of every change so I can replicate the setup later