Multi WAN or Failover Sierra

I am trying to learn/setup Multi WAN, Failover, etc. using Starlink hardwired to a LAN port on the XR80.

The Starlink modem has been set to “bypass” mode; which allows a direct connection to the antenna panel (powered via the Starlink POE power supply).

Are there any websites with how to do this (not necessarily involving Starlink but a second WAN source) on the XR80, XR90 or any Sierra Wireless?

Is there a better term or phrase to search here or elsewhere for?

Thank you, Jeff