I found this discussion where this node is also used. It seems to work, but only on 1 side of the 3D Space Box - like it doesn’t get the side of 3D Box closest to the camera.
Video how it works now - you can see this clearly on a chimney door.
Edit: Managed to fix that - i don’t know why but I set the BoxEnd X and Y values to BoxStart X and Y values. I will now put the arrows images on the corners and post the result, if it even works.