Put a 300 to be the Master Controller and you'll be ok. A 200 is for Standalone Only! Exception: If all 13 of your 200's are running their own system and you are not trying to link them together..
Where do you have your music stored in? HC 300 has no hard drive. Go to Media scan where you have your music stored and as long as your controller has access to the internet you should be able to pull cover art.