WAN Carp

[CloudNode]

Hello; I currently have CARP running with HA for my LAN interfaces which are all working great. I just purchased a 10G switch in which my main DHCP WAN connection will plug into and then my Primary pfSense connects via PPPOE and gets a DHCP Wan address. I then i have my backup pfSense connected connected to that 10G switch also getting a DHCP IP via PPPOE session.

Question is; would I need to configure CARP on my WAN interface as well so both routers dont always have a active IP at all times? If so, I am not too sure to set this up when my WAN is DHCP. Thank you