So something like tiling, but with taskbars on each screen that only show the application/windows of that given screen?
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I've had a look at tiling and yes, that with taskbar for each screen. I've been using that setup (with DisplayFusion) for years and now I can't work without it!
for the taskbar part: you can just add an additional panel to your second screen, pull a window list on it that configure it so that it only shows windows of that active screen (I'm currently not on KDE so I can't be of more assistance), kwin afaik has a tiling plugin/mode that you can activate.
The problem is that I need on for each virtual screen: 7, but thanks for the suggestion, I'll look into it
This is definitely not possible with base KDE. If you're using x11, you might be able to follow https://askubuntu.com/questions/1398508/split-a-widescreen-monitor-in-two but it's pretty fragile, and I'm not sure if KDE will respect those monitors.