There is a vent hole under the snout of the pump. The leak will come from there. It is about impossible to see this hole in the installed position so area is the main determinant. There have been tubes placed on some pumps that take the fluid to the drivers side behind the compressor, but usually the coolant drops from the front of the motor. Check also the hose to the head although you about have to remove the pump to get to it anyway.
Bosch Master, ASE Master, L1
33 years MB technician