Perhaps creating a symbolic link to this directory/these directories would be easier. I know that there is an option to create this link within the file manager but somehow it doesn't show. It is set in the preferences.
Yes, I believe that's the command to set the link. But I use the file manager for that. You will have to test it for yourself.
What do you mean by sensible for errors? I have no problems what so ever.
After Aravisian's comment I did some "research". wanted to know how to automount the drive, been doing this manually (was my own choice).
Using the app "Disks" (within System Tools), you can edit the mount options for a certain partition or drive to automount at boot. This will also automatically lead to a mutation for the fstab file. After adjusting the settings in Disks, you will have to reboot to make it all effective.
If you think carefully enough, automount could be a security risk. I'm thinking on the lines of ransomware, recent ones can actually identify make and model of external drive and comments on local Linux User Group have stated not always a good idea to have other partitions to automount. It's simple enough to right-click and mount. The comment was made when I told them that Feren OS (18.04) mounts other drives without asking.