I transfer books to my Pez with Calibre using:
My Books/{tags}/{series}/{series_index:0>2s} {title}
I use a single tag for my books that is the genre. This sets a "My Books" folder as the top level, followed by Genre. If a book isn't in a series, it is dropped there, if it is in series, a series folder is made and the books are dropped there. All titles are prefaced with the series number so they are in order.
Author is only important when I'm choosing a book for purchase. I don't find it useful to sort by author on my reader.
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