Hrm. Some more googling, I see I might be able to use IPMI tool to have some direct control over to the cooling and fan speed parameters that BIOS settings don’t allow for.

TrueNAS enterprise with the cluster mirroring for HA iSCSI for your hypervisor storage?

I’m getting out of the mom and pop web and mail hosting business and taking a very slow and long shutdown myself by moving out of co-location and into my basement. So just TrueNAS core, ESXi vsphere essentials to do the vmware snapshots for that end of the business.