Yip that's right. I definitely can't take credit for it, as
@B-127 helped me out with the setup and troubleshooting. I'm still very much a noob when it comes to Mikrotik but the way it's set up now, I don't have to touch it.
With my old EdgeRouter, I needed to mess with the failover settings often as it would 'forget' that I had a failover connected and revert to just one connection.
IIRC my setup uses mangle rules to determine which traffic originates from streaming sites and forces it to use FF, and then Netwatch is used to mark that traffic to reroute over Rain if FF happens to go down. I'll post up the cleaned config sometime