I’d do a supervised install on debian bookworm. This is the approach I’ve used for years. With this approach you can run other things on the OS if you need to. People will indicate that running things on the base OS makes the system non-supported, but the HA software doesn’t complain. As you’ll be maintaining the OS, you’ll have the freedom to run what you desire next to HA. Just be aware you need to make sure any software you add doesn’t conflict with HA.