Couple of items, I've used Promox for about 4-5 years now, very nice hypervisor have had no problems what soever
I current run it on a Dell R-610 with 96Gig of ram and 6TB of HD, hosting 5 linux servers and desktopsetup with about 8 domains and 1 email server all are Linux based, the mail server is awesome
system called Zimbra completely free, I'm hosting a number of open source decentralized social network, Peertube (Youtube work alike) , Mastodon (Socal Network) , Piwigo (Picture hosting), OSSN (Social Network)
, WebTrees (Geniology), OsClass script (ForSale/Want ads), Simple Machines (Forum), WordPress (Blogging site)
So I use it alot
I might also recommend highly the use of Virtualmin as a hypervisor I have used it for about 2 years and am a subscriber to both systems
Proxmox cost me 175.00 a year two processors 75.00 each for updates/upgrades and the Virtualmin is 7.50 a month for updates/Upgrades
I might also say the virtualmin really has a nice routine for easy installation and renewal of Lets Encrypt
Keith
Keith D. Miller