I've been working on this for the past couple of day (too long, I know - I'm new). The only thing I've come up with is to constrain the position of one actor to another, with an offset. I'd actually like the gravity on one to impact the other, as in dangling, but that seems beyond me at the moment.
Constraining through game level attributes is the way it is usually done and easiest to setup/manage from scene to scene.
At the actor instance level, you can constrain an actor's attribute(s) to another actor's attribute(s) without the use of game level attributes but this can lead to nightmares if you edit the actor prototype those instances are based on or you want to use them from scene to scene (i.e. manual setup required in each scene).
I think you can simply use an (invisible) parent actor to automatically spawn the necessary visible child actors upon creation. When you spawn the visible actors, you can also set their relative offsets to the controller actor. HTH.
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At the actor instance level, you can constrain an actor's attribute(s) to another actor's attribute(s) without the use of game level attributes but this can lead to nightmares if you edit the actor prototype those instances are based on or you want to use them from scene to scene (i.e. manual setup required in each scene).