The view distortion is not a big deal. I want to place a kind of goal marker on the map.
Anyway, the answer was easier than I thought:



Thank you all!

EDIT: the actual reason for using this way is because I'm working on a splitscreen game, but panels don't clip a the cameras border, so one panel can overlap with the view next to it etc. If you know a way how I can keep the rendering of a panel inside a specific view, then I'd prefer using panels.