Thanks, Yes we do. Like described it works.
BUT:
proxmox node:
eth0 -> vmbr0 with its unique public ip of proxmox node like 100.100.100.5 (not connectet to vRACK, MAC OVH mac binding direct to this hardware server).
eth1 -> vmbr1 is vRACK interface ip 192.168.1.5.
Other public ip block...