I recently used this (via https://depenguin.me/) to install FreeBSD from a Linux Rescue Image on a Hetzner root server. Hetzner sadly discontinued the FreeBSD Rescue Image.
This installation method uses KVM to boot the mfsBSD image, giving the VM the actual hard drives to install on. The one thing that tripped me up was that the network interface presented to the VM did not use the same driver as the physical network interface. So the FreeBSD installation configured (in my case) `em0`, but once I rebooted into FreeBSD, the network interface was `igb0`.
This installation method uses KVM to boot the mfsBSD image, giving the VM the actual hard drives to install on. The one thing that tripped me up was that the network interface presented to the VM did not use the same driver as the physical network interface. So the FreeBSD installation configured (in my case) `em0`, but once I rebooted into FreeBSD, the network interface was `igb0`.