Looking for a way to apped a component like an empty in Blender? So far used a Static Mesh but hidden.
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What’s it for? A scene is pretty minimal…
For example in a BP made a Dice and to get the up facing side added Static Mesh Spheres. Wanting to make a grid distribution with lots of empties.
Yes, use scene components 
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Cool thanks, has transform location. Is there any way to keep track of it without selection, can’t tell where it is.
That’s the whole point, it’s invisible
But if you want to mark it, then attach another component underneath. But isn’t that just like using a sphere?
For data containers without representation on the map, attach an actor component.
For data containers which have a transform on the map (and thus can be dragged around using the scene editor), attach a scene component.
For data containers which have a transform and a representation in a form of a mesh, use primitive component. However, in BP you cannot use the primitive component base class directly, you have to attach a sphere, box or capsule.
And finally, a static mesh component is there for you, to choose your own mesh to represent. If you look into the documentation, the static mesh component is also a primitive component (by inheritance), the same as other splines and text renders, arrows.
To summarize: actor component is empty, scene component has a transform, primitive component has a mesh, but in BP you have all sorts of ready to use primitive components, like static mesh component, or shape component (sphere, box, capsule).
I hope I helped, have a nice day!
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Ok thanks for clearing that up a bit.