The only way, I know to place actors more efficiently, is to place it in 3ds MAX scene.
You can export it to one fbx, and then import a whole scene into unreal by clicking “Import into Level” button in the editor.
Every object, that has been instanced in MAXscene, may be instanced in the UE4. To do so you need to check “Preserve Instances” when exporting.
Working that way, will save you from place it procedurally in the blueprint.
But I don’t know about HISM. It would be nice, if same process can be done with that.
For now I use a tool called “Instanced Tool”(see in Marketplace) to work that way.