Shadows eluded me for a long time so I try to keep is simple with a standard procedure to start: Light 1: Set with no shadows and with a low intensity to provide ambient light ... this one can be pointed by using the dials reliably. Light 2 and 3: Set as spotlights, set to point at key parts of key figures or props, with a shadow set at .5. By pulling back from the scene, the spotllights can be seen as reflections on the ground plane. If they can't I reset the xyz settings at zero and move them as needed ... avoiding walls and such. For fancier settings, more spotlights are added with more or less shadow ... other settings are refinements on this.

Gordon