PfSense with Ubiquity and DNSThingy

[GreenMantis]

Hi,

I have existing setup with ubiquity hardware as follows:
ISP Router (in bridge mode) <-> Ubiquity Pro 4 Firewall <-> Ubiquity network switch <=> 2 Ubiquity APs and wired devices.

Ubiquity firewall lacks few things, therefore I am considering using pfSense firewall with DNSthingy, snort, clamav, etc. I can set up pfSence with a single NIC set up per https://www.dnsthingy.com/support/pfsense-single-nic-setup/ but it'll provide limited functionality. Can someone provide best or a better way to integrate it into my current setup? I'd like to keep ubiquity firewall in place if possible.

Thank you