If you have a seedbox, generally you won't have root permissions, which may result in you being unable to mount or create folder in the /mnt. It could also be that someone else is already using the same mount point.
Can't you just use a folder in your home directory for the same?
i got that mount to work via "rclone mount --allow-non-empty --cache-db-purge gcache: ~/mnt/gdrive"
i made 2 of them. gcache2 and gdrive2
så i kan uploade som 2 accounts at the samme time.
but today i got another issue.
thinks uploaded from gdrive is not always showing on gdrive2 ( folders are just empty )
scanning folder shows 3TiB on gdrive but only 2TiB on gdrive2