Hi @jaywalker
I can confirm that NS8 runs well on Debian 12 on Proxmox.
For details on setup, read the howto. The howto even includes Proxmox hardware settings etc.
Here are a couple of real testimonials / howtos with Debian 12.5 on Proxmox PVE:
PM me if you need specific suggestions how to bring size / ram / cpu / users all under one hat!
Not always public… 
My 2 cents
Andy
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