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Looking at the screenshot, it looks like Windows recognises the screens as two separate displays and not a one display with the content stretched across both screens.
As that's the case I think you might find it difficult to find any software that displays across two separate screens in the fashion you are asking.
If you are able to find a way to get Firefox to stretch across both those screens then the EPUBReader add-on (see the dedicated section in this forum for it) can be set to display the epub content in columns (you can set it in the settings for as many columns as you like). It is also touch-friendly as you only need to tap the side of the screen for it to change page.
I use this on my Acer 1825PT convertable tablet and it works well for touch-screen use.
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