Rclone with Home NAS and Dropbox

This will be for Mint or Ubuntu. I'm looking into ways to encrypt my data and have it sync to the cloud. Something like this:

  • Home NAS as the shared writable storage pool for laptop and PC, plus anything else that gets added later
  • Two NFS mounts on the NAS: one for the shared writable data, one for Dropbox
  • Rclone from NFS mount #1 (shared) into mount #2 (Dropbox)
  • iDrive backs up either mount #1 or mount #2, whichever is easiest

Can Rclone do a "many to one" sync into NFS mount #2 (Dropbox) from multiple devices? I looked around at previous threads and read the documentation for the multiwrite union functionality, but I'm still not clear on if this will work for my scenario. I want to keep mount #2 synced if I edit the same file from mount #1 from multiple different devices, provided that both have mount #1 & 2 available.