I don't think launching at intervals will help if you are planning on doing a geostationary orbit. You launch the first one, put it into geostationary orbit. Now it is sitting right above the command center. You wait four hours, launch the second one, but because the first one was in geosync orbit it is still right above the command center. You will end up putting all of them right on top of each other (assuming same launch trajectory). I think this method could work if it wasn't geostationary depending on various factors, but I'm by no mean an expert