The house number shall be placed on the principal building in a conspicuous place as near as may be to the main entrance thereto so that it may be easily seen from the street extending in front of said building. The requirement for house numbers as specified in this article shall be the minimum requirement. The owner, agent, lessee, or occupant of any principal building may place such other correct house numbers on such building as deemed necessary so long as the minimum requirements of this article are met.