I am trying to re-do part of my irrigation system that the previous homeowner installed. I have around 5 too many heads in the front yard. I want to put 3 in the front of the lawn - one in each corner and one in the middle. The mailbox is about 2 - 3 feet from the driveway, and the typical distance from the street. I'd like to put one head in the corner of the driveway to cover the grass parallel to the driveway and also a flower bed lining the driveway. If I do this the mailbox will block the s...