From memory following their guide they take the rad out. Just as ease of access thing really then I assumeI fitted a wrc a.c. delete a couple of weeks back and didn't need to remove the radiator, I just removed the air con rad from the front of it.
I can't see why the pms kit would be any different
This is trueFor all the extra time involved I just took the rad out the way to make it alot easier for myself as any space gained is always an advantage when working on the clios!