Updated: Jan 7
I am getting asked this a lot recently, so I decided to do a quick diagram to help you. See my other post here on the main 3 Shungite shapes (Sphere/Pyramid/Cube) to give you some perspective on them and placement ideas.
One last thing, with the amount of smart meters being installed, people are wanting to put Shungite in the meter box. Be extremely careful, as the Shungite is electrically conductive.