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hugo7
As far as I understand the rad needs an air gap otherwise you won't get as much/any convection. Similar logic for putting new rads beneath windows; gives a large temperature gradient adjacent to the rad and thus more convection so the room is better heated.
I would put as much radiator into every room as you can fit/afford. If you have too much rad then you can run them cooler - possibly more energy efficient, and more comfortable if you're right next to the radiator. Conversely if you have too little rad then you'll run them hot, possibly be uncomfortable when right next to them, and still have cold spots in the room.