It doesn't matter. The device will either generate the cover from the first page of the book, or, for sideloaded kepubs, use the image marked as a cover and resize it as needed. Or, id you are using calibre, there are options in the KoboTouch driver to send the cover. That will size the image as needed.
So, what is the problem you are actually seeing? Or maybe, what are you seeing on the device when you expect a cover? And what format are the books?
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