All the pods you purchased in a set are identically manufactured. After setup, you can connect whichever pod you feel like!
During initial setup, you will need to connect one of the SuperPods from your Starter Pack to the modem or router. For best performance, a SuperPod should always be the Gateway pod (connected to modem/router).
This also means that each and every Ethernet port on your pods are active. Please feel free to use these ports to hardwire devices that you wish to connect to the Internet via an Ethernet cable.