How does one sync a NAS and iTunes libraries on other computers?

Here's the setup:

  • multi-TB NAS
  • Two laptops
  • Apple TV

What's the best way to automatically sync new music on the laptops to the NAS? Was looking at http://mediarover.com/, but haven't heard too much about it. Anyone have any go-to solutions for keeping new downloads synced to a larger iTunes library on a NAS / external drive? Don't need two-way syncing.