I’ve been running OPNsense as a VM in Proxmox for a year on an AliExpress box that doesn’t have ECC. If I might ask, why do you have a requirement for ECC?
Before this box, I ran a Dell R230 with pfSense but got tired of the noise and 40 watt power draw.
I’ve had zero issues without ECC, so I’m just curious about your need for it.
I think I am going to be one of the people buying into Zen 5 but mainly for the longevity of the platform aspect. I’m in the preplanning stage of my next ProxMox server that will be my NAS (unRAID VM), local infrastructure (Samba AD, Adguard, etc.) & Gaming PC via Parsec/Moonlight or plugged directly into the PC with GPU/NVME passthrough to a VM for gaming.
Firewall is on a separate ProxMox host so if the ProxMox host needs a reboot internet will be fine.