Beware! You can 'check out' a title multiple times and when you look under "Manage Your Content and Devices" it won't show you the multiple check outs. I had 8 books listed, two with audio content and I was thinking maybe the audio content was counted as its own individual title, BUT when I attempted to check an additional book out it went to a page that said "Return a book to continue", and under Return Another Book it listed all the books and one title three times.
I'm not sure how long I'll continue the KU subscription. At the moment I have Overdrive priorities I have to read before they expire so I haven't gotten a chance to even start the first book I've checked out. Just playin' around for the moment.