pfSense: NAT firewall rules for Multi-WAN setups

This guide assumes that you have setup Gateway groups with the appropriate tiers as well as DDNS setup. For my setup, I have 3 tiers (Fiber, coaxial, and LTE through a VPN to a VPS provider) and I use Cloudflare as my DDNS provider. Both are needed for this to work properly. In order this
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