Is there a way to stretch the wallpaper across 2 16:9 monitors while maintaining the full vertical height?

[KwameFlip]

No matter what fit option I choose in windows, I can't get the wallpapers to stretch across the monitors without losing part of the image.
The only way I can get the wallpaper to span horizontally across both monitors also results in losing the top and bottom.

Could there be an option in the app to stretch the image whilst not cropping it at all across two monitors?