Didn’t know about AtomicToolkit.
I followed JDM_Waaat 's recommendations:
NAS [Guide] NAS Killer 4.0 - fast, quiet, power efficient, and flexible - starting at $125
Seperate PlexBOX [Guide] Hardware Transcoding: The JDM way! QuickSync and NVENC
I use unRAID on my NAS with all the dockers you need as a downloading box
What I love about unRAID is that not all my disks are written to at the same time when downloading or copying, etc