So you have a single piece of hardware that handles both modem and router functions.
Plug in any Plume Pod into one of the available Ethernet ports in the modem/router. If you use the Wi-Fi on your modem/router combo device, don't forget to turn off its Wi-Fi to avoid unnecessary interference and client connection issues.
Can I connect Plume to my existing router?
How do I switch my current router and network setup to Plume?
How do I setup Plume and keep my hardwired devices connected to the Internet?