You’ll still need the modem as always, but can ditch the router! From now on, your modem will connect directly to Plume.
Whichever Pod you connect to the modem will automatically become the Gateway Pod that directs all others, so no need to be picky.
Here's a diagram of your old setup:
Remove the old router and replace it with a Plume Pod.
If you need to keep your router to access some of its features, you can setup Plume by connecting a Pod to the router. Just remember to turn WiFi off on your router after the setup. You have the option to change the network mode of your Plume to bridge or auto mode.