Yes, you can use Perch to watch multiple locations.
You have two options:
1. Simply add all locations to your Watchlist. You will see updates for each business on your home screen and in your Email Digest. When you select the locations from your Watchlist in Settings, you can quickly see social stats for each.
2. Set up a Perch account for each of your locations. You will have to use a different email address for each location in order to receive the Step Up Series and a Performance Report for each location.