Tile windows horizontally in Windows 10 with the same behaviour as tile vertically
Solution 1:
I have a workaround for that which still requires manual adjusting: do the regular "snap to" procedure with the WIN key + arrow left or right and then, still holding the WIN key, press the UP arrow so the window becomes a quarter of the screen rather than only the left or right half. Release all keys, it will then ask you which window to resize to the other half; use the WIN key plus right, left, up or down keys in the same way, to arrange the other resulting quarter screen underneath the other window. And then, finally, manually pull the right margins of both windows which should by now be horizontally tiled, to the end of the screen.
Solution 2:
The PowerToys tool is an Windows 10 App that allows to create tiling-like windows layouts. You can create layouts of multiple tiling-like windows and enable the tool to launch at start up so that it's always on display. The video demonstrates it all. There are other features. Which you can decide to enable or not.
So it's kind of a valid workaround. It involves no keyboard shorcuts, and no coding on your own. You need to dimension the layout's windows yourself and then sav the layout. No redimensioning 'on the fly', but you can create many layouts to suit your needs.
1st PowerToys Youtube Tutorial
2nd Youtube Demo + other tools in video description
PowerToys Github
Power Toys Stable release .exe download page
Linux i3 Manager is also an App alternative for linux. But I haven't tested it.
Linux i3 Window Manager