From doing various tests on 70 camera scenes and having some cameras not always align, I wonder if it might be possible to augment marker placement in 2d photos by also allowing positional placement and tweaking in 3d perspective workspace to help refine average overall positions on all photos, instead of having to go in to each photo to tweak position of each marker?
So place positions first in 2d photographs, then go into perspective and refine positions in 3d to then affect the placement in 2d photos.