Useful for the continental motorway stuff and parking clocks. When I go to Europe now, I stick all the motorway vignettes onto a thin plastic sheet and put it in the clip. If you put them all in the windscreen, it blocks the view!
Will, you could fall foul of the law, at least here in Austria. Firstly, there are rules about where the vignettes must be placed in the windscreen. Two locations that I can remember are top centre (I have mine behind the rear view mirror), and top left (offside here). Secondly, they
MUST be physically attached to the screen. The reason for that is to stop you switching them between cars - they are only valid for one vehicle. Once applied, they are self-destructing if any attempt is made to remove them. There is a real risk you could be fined if it's stuck on a plastic sheet or not in one of the approved places. Mind you, ours has only been checked once in over 4 years - they have occasional checks on exit slip roads to make sure they have you bang to rights!
