Where am I supposed to post my address numbers?

For reasons of life safety (such as the ability of fire and police personnel to find the location of emergencies), all residential and commercial properties are required to display the assigned address numbers on the building so that they are clearly visible from the street. The numbers are to be a minimum of 5 inches in height, of contrasting color to the mounting surface and within 10 feet of the front door. Script writing (i.e. One-Twenty-Three) does not meet this requirement.