Thanks for mentioning that, eXpl0it3r
With Sprite 3D, if you set the origins to match globally:
(all objects have their origin set at where the green circle is at the bottom - origins don't have to be within the bounds of their object)
then, rotate causes them to all rotate around that same point:
Additionally, you have the option of specifying an origin's z position too, which can be useful to create depth after rotation.