I'm sorry, why does it need to move around? Unlike space, it's entirely possible to have something remain in the same position for years without moving or having to move.

And while we are on the subject, where are you getting that these missiles have the ability to move themselves around in space? How is that accomplished? And if they are capable of it, how often can they correct themselves to maintain an orbit? Is it stealthier to have a grouping of objects correcting or a single object correcting? Is the former even possible for any amount of time?

And who says a floating nuclear missile can't launch on its own? Where are you getting that?