@christianselig as others have said, finding the screws attaching the wall board to the studs is helpful. Are you sure you have metal piping and not PEX?
Studs will be evenly spaced, but pipes won't, so you might be able to eliminate the pipes if you find enough studs.
Good stud finders will also have a mode for detecting live wiring: https://www.boschtools.com/us/en/boschtools-ocs/inspection-detection-tools-gms-120-35140-p/