In this repository is simple kwin script that position windows. It defines three section on the screen. 25% 50% and 25%. In this areas windows can be placed using shortcuts.
git clone git@github.com:darkmoon32/ultrawidePositioner.git
cd ultrawidePositioner
plasmapkg2 --type=kwinscript -i .cd ultrawidePositioner
plasmapkg2 --type=kwinscript -i .