hi HA work in docker
i think all installations on all arch install:
debian or alpine + docker + supervised installation (fews containers) or a simple home assistant container
i don’t how you can run it without docker.
and add-on are docker container
i m using a nuc; it’s a mother board you could use in an optiplex.low electricity and big power from intel cpu. you have enough power to add all services you wish , as owncloud.plex,web server etc…
to me it"s one of the best option to run hassio.you can replace ram hdd ssd …a real computer/ personal server