UDM Pro behind pfSense

Hi folks, I have a home network setup like this:
[ ISP Modem –> pfSense –> UDM Pro –> USW-24-POE –> UniFi APs + UniFi Cameras ]
I’ve tried several different ways I could think of and search for to avoid double NAT issue, but no success. My reason to keep the UDM Pro is to use its Controller and Protect feature to manage the rest of UniFi equipments.
Anyone got a trick to avoid double NAT? Appreciate it!

Nope, and this same question has been asked a few times before Search results for 'udm pfsense' - Lawrence Systems Forums