Dual WAN with CARP on one ISP and not the other

[ajeffco]

Hello All,

For home use, I currently have Spectrum Internet which does not provide any advanced features such as static IP or /29.  AT*T is running fiber in my neighborhood, and expect to have service available soon.

I currently use an OPNsense CARP setup running on a dual node Proxmox setup on the Spectrum WAN which is working fine.  When I get AT*T Fiber installed with a static /29 setup, I'm planning on installing OPNSense in a config as shown in the attachment, and move away from Proxmox for the firewalls at the same time.

What is the optimal way to run a setup using CARP on one ISP and not the other?  Is there a better way provide dual firewall redundancy with dual WAN?