How to enable horizontal split in full screen mode in El Capitan

I use my external display in tower mode. I've been using third party software ( like [Moom](https://manytricks.com/moom/) ) to split my screen horizontally when needed. Now that El Capitan supports split screen in full screen mode, is there a way to split screen natively with two apps in horizontal split, in full screen mode. I searched everywhere and I am able to place two apps side by side but not top and bottom. I have also tried reducing window sizes of apps so that they fit well when in horizontal split mode. But still I never get the option of putting one on top of another. Is there any other settings I need to enable? I have enabled Displays have separate Spaces