I'm with an NGO in rural West Africa and internet options here are very unreliable so we rely on multiple backups. We use our ER605 for load balancing and link backups. We now have Starlink, which we're using as our primary WAN, but I want to set it up so if Starlink disconnects (typical during tropical rains here), then it switches to and LTE network and if that's down (as it is 80% of the time), it switches to an alternate 3G network. We have each independent modem/router setup and connected into the ER605 with WAN, WAN1 and WAN2, but under load balancing Link Backup - it doesn't seem like we can setup the cascading backups (if WAN is down, then  WAN1, then if WAN and WAN1 are down then WAN2). If I set WAN and WAN1 as primary, then it seems to load balance between them, which is extremely expensive to pull on our LTE connection. Any suggestions? Thanks!