Proxmox
Setup Proxmox with 1 Dedicated IPv4
Setup with Proxmox Nginx reverse Proxy and disable direct access to 8006
Configure IPv6 for your VM's (OVH/SYS/Kimsufi)
Configure IPv6 with ndppd for your VM's (OVH/SYS/Kimsufi)
Things you should do after install
Tunnel bridge via Tinc VPN
Upgrade Proxmox 5.x to 6.x