so i need to do this for my home, where connection 1 is via 4gLTE with 20GB limit, then i want to connection 2 my "wifi as wan" router to another SRX port so when it connect to our phone with unlimited 4gLTE
do i just need one probe on connection 2, so if it is up it will route that way and if it is down it will jsut use connection 1?