[ownedbycats]

Would not recommend it based on tags; taglike columns can have multiple entries, which may cause issues especially if the path length goes too long.

But if you do it anyways, you'll want something like:

documents/{tags}/{author_sort:sublist(0,1,&)}/{title}

As I mentioned before, I'd more suggest a custom column. Then you can put #booktype (or whatever you put as the lookup name) in place of 'tags.'

You can change the send-to-path device in Preferences > Sending books to device. If you use a Kobo, you'll want to change it in the KoboTouch(Extended) driver settings, which is available through Plugins.