I've yet to come across one of those and the Luftwaffen-drillen M30. Though I cannot say I am looking forward to an encounter with the former.
Mount Olympus, Lebisey, Operation Cobra, Operation Goodwood, Operation Totalize, Purple Heart Lane, Villers-Bocage, Bardia, Sidi Rezegh, Alam Halfa, El Alamein, Mersa Matruh, Operation Aberdeen, Supercharge, Mareth Line. Almost every single map in FH2 has the Flak 18.
The Luftwaffe Drilling can be found on a special kit that is hidden on some Normandy maps.