I don't really understand your picture, but I have run Proxmox with only virtual network bridges and just a single physical cable between a modem (1xIPv4) and a pfSense VM (with PCI passthrough of a single port network card).
I don't really understand your picture, but I have run Proxmox with only virtual network bridges and just a single physical cable between a modem (1xIPv4) and a pfSense VM (with PCI passthrough of a single port network card).