More than two windows split view Is there some sort of clever hack of achieving that, because I did not find anything. I have a 27" Mac and everything is still kind of huge.
No - you get two windows in the current implementation. One on the left and one on the right. 

I suppose the notification center slide over could be considered a "third window" but you can't put an application window there - it's just a system tray of sorts.

I would look at a program like Divvy on the Mac App Store for customizing a workspace with multiple tiled windows. It's not split view, but it's far more flexible and able to make use of the 27 inch display space to quite a granular basis.