I have 4 small utility boxes, each about 2' high, in the middle of my backyard along the property line. 3 of them are close together, and 1 is a few feet to the right. What can I plant in front of them so that I don't have to look at them? I'm thinking some type of evergreens that don't grow to be more than 3' tall for year-round coverage. Any suggestions? Thanks!