If I had a firm requirement to have only one physical piece of hardware home server on bare metal to run further containerized things on, it would be running proxmox, because that grants the ability to run further QEMU, KVM virtualized things, and then to install docker containers inside of any KVM VMs. Even to use QEMU to fully emulate other CPU architectures if necessary.

Or if not proxmox, without a http GUI, just a boring debian stable x86-64 system to manually install QEMU and virt-tools, virsh toolset on to run QEMU/KVM things on with purely CLI management.

This is an interesting general concept but being limited to only running docker containers is a huge constraint.