For technical works, e.g. programing, I like Goodreads, (ios), I get the pdf's so the layout is true to the printed book. I set it up to present two page spreads, then zoom out to view the lefthand page, swipe over to view righthand page, (10.5 Ipad). you have to include cover sometimes to get even-odd ordering of the spreads. You can trim margins to reduce wasted space.