I've finally managed to get my hands on a backup connection to help deal with the flakiness of my main connection. Therefore I will be joining everyone in the fun adventure that is multiple WAN. :)
The documentation is straightforward but seems to assume that I only have WAN, WAN2, and LAN. Unfortunately, my network is a lot more complicated with DMZ, IOT, etc interfaces.
Any advice or recommendations for someone entering into the world of gateway groups? What pitfalls should I make sure to watch out for? I'd like to avoid having to rebuild everything from scratch just yet.