May I get a visa in LA for both me and my wife?

My wife and I live in San Diego, CA. My wife and I are taking a September cruise which makes three stops in China (Qingdao, Dalian, Beijing). The cruise line (Princess) says this will require a single entry one for each of us. May I take our completed application to the Consulate in Los Angeles and obtain them for both of us, or do we both need to be physically present at the Consulate?