I have updated my scripts on https://github.com/BinsonBuzz/unraid_rclone_mount and the first post in this thread (partially) to include mergerfs support.  I will keep github updated, so if you want the latest versions then watch that thread as well.   I've also improved the annotation so if you are already setup with unionfs it should be easy to change:   How to Migrate from unionfs: In the new mount and unmount scripts find and replace mount_mergerfs with mount_unionfs and all