Is there a way to mount multiple storage drives for Plex / Rclone?

I read one of the questions that stated you can mount 2 drives with Vampire box. So, I'm planning to upgrade to Vampire Box, but I'd like to know if it's only limited 2 drives or I can have any number of storage drives?

UPDATE: According to this, Vampire Box or higher gets only 1 additional mount.

So, is there any way to increase the number of mounts?