5 Door Surface Vertical Mailboxes
Answer: They are not rated for outdoor use, but as long as they are under some sort of roof and protected from the elements you can install them on an exterior wall.
Question: Dimensions of 5 or 6 unit wall mount mailboxes.
Answer: The total dimensions of a 5 door Wall Mount 4C Unit: 29.75"W x 19"H x 7.5"D.
The total dimensions of a 6 door Wall Mount 4C Unit: 35.25"W x 19"H x 7.5"D.