Depends on the version. There were a lot of modifications for the He111H. One of the more common had a 7mm flex mounted in the nose, a 7mm flex mounted in the dorsal position, a 7mm flex mounted in the rear ventral, and depending on the version an MG/FF flex-mounted in the forward ventral (the guy in the gondola would operate either gun as needed), but its arc was somewhat limited.
I know some had the side guns, but I think they were often removed because they weren't effective (firing through tiny windows). I don't know the specifics of that bit of info.