I have only searched for English addresses on Ancestry. I don't know if there's an easier way but I just went into the census I wanted and then 'view all collections included in this search'. Searched for the country, the county, the civil parish, the sub-registration district and the enumeration district. You'd have to look on Ancestry to see what I mean. This may require looking through several enumeration districts! After that I trawled through the entries looking for the correct address. It was long and tedious and you need some idea of where your ancestors lived. I have no idea how Scotland's People works so none of this may be of any use. All I'm saying is that it could be a long process, unless someone knows a quicker way.