One of the best ways to get yourself noticed as a small press is to undertake very interesting projects. Twelfth Planet does this brilliantly. The latest book of theirs that I have uploaded is Above/Below, a back-to-back double containing two linked stories: “Above” by Stephanie Campisi and “Below” by Ben Peek.
She even notes there are not one, but two ebook versions of the book. To keep with the flavour of being able to read either side first, there are two editions, one that begins with 'Above' and the other that begins with 'Below', so you can buy the one you prefer to read first.
And, obviously, you want a link to buy it.