I checked with LD and she said you can set this up anyway you want. In other words, the top 3 bidders will be the winners. The bigger issue will be making this clear - that unless you're the top bidder and you want the book, you won't get it.

if you're in the top 3 and you want the tea set or recipe book, you are OK.

so....perhaps add this to the bidding info? or the post?