You probably just need to chow. The directory

If I remember correctly mnt is for static media that you expect to always be present and media is for removable media which may come and go.

For 2.5" SSD I’d suggest a Samsung Evo or crucial mx500. These will top out at like 4TB afaik.

For 3.5" spinner I’d suggest an enterprise class HDD. Specifically WD Gold or HGST. Look up the most recent backblaze drive failure report for some models known to last a while.

What are the chances of an official flatpak getting maintained so us lazy folk don’t need to keep up with the GitHub repo/site for when updates drop?

Edit: Also do you have any plans to add NX support?

BSD, Haiku, Plan9, RiscOS, etc. Probably mostly BSD.