pfSense HA - WAN Switch

Currently have a customer with a single Netgate pfSense forum, and a fiber terminated leased line.

Looking at getting another identical firewall, and running HA.

On the LAN side there’s an XG-16 UniFi switch with 10Gb DAC into the pfSense Box.

Has anyone ever used a Ubquiti Aggregate switch for the WAN side? Looks to be a reasonably priced SFP switch?

As for management, I was thinking I can either connect the XG-16 to the aggregate switch and do the WAN side stuff in it’s own VLAN, or just manage this switch on my AWS hosted UniFi controller?

I have not specifically tested it on the WAS side but it should work.