@Denny    No, this MultiWAN Backup Uplink(with support MX hardware) doesnt limit to cellular and it should be infrastructure/technology agnostic as long as your backup uplink has Internet . The followings are the common use cases of it.    Use case Third Internet link as backup: Configuration of a tertiary link to serve as backup in case the primary and secondary links fail. Meraki Cellular Gateway MG as wireless WAN backup: Connecting an MG for wireless WAN backup use cases without sacrificing a hardwired connection. ... View more