Allow me to jump in and suggest Proxmox. The instructions can be found here and firing up any VM (including Frigate LXC) is as simple as a 1-line install using tteck’s scripts.
If you’re still dependant on Blue Iris, it should be as simple as installing a minimal image of Windows inside Proxmox (though there’s no 1-line installer for this in tteck’s site - you’ll have to install the “hard” way).