In KDE Plasma, Super + T brings up a built in tiling feature. It’s super basic, but allows you to set static window snap zones on any display.
Each zone can be split horizontally or vertically, and you can adjust the zone-gaps to the exact pixel you want.
It’s not dynamic as far as I know, but for me it’s all I need.
Once you go back into regular desktop mode, you can use the zone snaps by holding shift while you drag a window. Releasing the window while holding shift will snap the window into the current snap zone it’s closest to.