If you're on an X11 based desktop system I would highly recommend Quicktile[1]. I have a 43 inch 4k too and the 3x1 layout is one of the most common I use. Centering a single window in the middle is also very useful. On my mac I use Spectactle[2] instead and I have the keyboard shortcuts mapped the same on both systems. If I would use Windows this looks like a good option.

[1] https://github.com/ssokolow/quicktile [2] https://www.spectacleapp.com/