We recommend that you connect one, and only one, of the Sonos devices (Sonos speaker, Sonos Connect or Sonos Boost*) via Ethernet to one of the Plume pods and have the rest of your Sonos devices connect via wireless to the network. This enables the Sonos speakers to form their own ad-hoc network, independent of the WiFi network in the house (BOOST mode).
*If you have a Sonos Boost device, if possible, that should be the one device plugged into the Ethernet port on the Plume pod.
Connecting multiple speakers to Plume pods will cause a network loop issue so please make sure that only one of your speakers is hardwired to a pod.
Remember to power cycle the pod after connecting the Ethernet cable so the pod will properly recognize the device.