Construction Question: Location of gas meters on duplex

[Garen T.]

Post # 6 on my duplex construction project.

Builder asked me a question this week about locating the gas meters. He suggests putting them on one side of the duplex making it a one-stop trip for the meter reader. However, this seems like it could cause issues between the tenants. Based on suggestion from here, I'm already going to put a rock strip down the center of the driveway to make it very obvious where the driveway ends for each side. 
However, same issue for the gas meter?

Separate water meters will be out at the street, so no issue there.

Advice?