The Novoflex Uniklem-42 is is a handy compact clamp solution for affixing a camera (with or without a ballhead) to akward scenarios such as tables, boards, pipes, car windows, etc.

Two support platforms are arranged at right angles to one another, and both have a 1/4"-20 female threading.  One male 1/4"-20 threaded screw is supplied, and this has a built-in flathead screwdriver fitting so that the weight could be kept down while the device could nonetheless offer vertical and horizontal camera orientation.