[Solved] Dual WAN set-up, just need final piece of guidance

[Amm0]

@KiwiGuy

What if my ISP assigns fibre IP addresses dynamically?

You'd use a DHCP client script that uses the $"gateway-address" variable to set the [recursive] static routes. And set the default-route distance to higher number or just set add-default-route=no in the /ip/dhcp-client.