I'm actually diving into Linux and Docker for the first time right now, and the setup you described is exactly what I'm looking to do. But seeing as this is my first time. I was hoping I'd be able to get some confirmation of what my idea is or find faults with my setup.
In terms of hardware I have on-hand, I've got two laptops. One of which is a half-top, meaning it has no screen. The other is my daily driver. Both are running Linux Mint.
The half-top has 1TB of storage and would have Docker installed with Plex/Jellyfin, the *arr suite, and HomeAssistant.
On my daily driver, I would be running Portainer or Heimdall to access everything and make changes within the half-top itself. I would also use this to access any of the media I have stored in the half-top.