Are you saying the RUT950 does not have the ability to run in "Failover mode"... behind another router?
I like the RUT950 but it is 100mbit, not Gigabit ethernet so actual throughput is 90mbit, well below my 150mbit Internet connection.
RUTX09 looks like is may be viable, was hoping to not need it since they are expensive. AND getting one in the USA doesnt look easy.
I need: Cable goes down -> failover to LTE ... Cable comes back -> failback to Cable, disable LTE
... using the ASUS, then the RUT looked like I could use what I already had.