One advantage with having separate installations is that during the time of war, another country cannot attack these installations, as it is IAEA safeguarded and IAEA knows that it is meant for civilian purposes. An attack on such installations will evoke strong reaction from international community. An adversary may have to think twice before attacking such installations
On the flip side, every body in the world will know where are the military installations and where are the civilian installations. It will make them much more vulnerable