The idea is about allowing to show different activities per-screen.
And also to avoid refuse heap, when changing resolution.

Ideas:
a) Allow to plasmoid attachment.
Plasmoid will have attachment (screen edge/corner) and relative position to it. When resolution changes, plasmoid get automatically moved based on this information
b) Save different layout per screen/resolution
User may change position of plasomoid per each resolution/screen. User would not change plasmoid set or plasmoid's settings, only positions.

Give another ideas or discuss.

Is this an actual question or a suggestion? Maybe better suited for Brainstorm

Yes, this is definitely not a question. But brainstorm on this forum is not a brainstorm, because people are vote not on solution, but on main thread post.