GeoRef with base station height


I have a question concerning the GeoRef of pictures. My drone has a RTK modul which is coupled with a base station. Before the flight I inject the RTK/GPS in WGS84 (Lat/Long) and the Alt in WGS84/GRS 80.
Which settings (in the GeoRef mode) are necessary to get GeoRef- Pictures, which have/contain the height over the base station?