Does the Plug M Gen3 have per-outlet energy metering, and what's the max load?

Yes - it has built-in power metering (voltage, current, and power monitoring) viewable in the Shelly Smart Control app. However, it's a single-outlet plug, so metering is for that one outlet only (not per-outlet on a multi-outlet strip). 🔌 Max Load: 13 A / 3,000 W