that’s part of the issue! If you actually look at the trash guides you’ll see most of the guides just say “There is no special set up required.” and the rest of the page is blank.
That page you linked to shows how arrange your directory structure for hard links (but not how to mount the drive to match /mnt/ or, with exception of a single screenshot, how to configure the software to hardlink)
all of which were things that took me several hours to google, experiment and understand.