You will want to place the Smart WiFi controller in a location has 1) power and 2) an ethernet (Internet) connection that is CLOSEST TO YOUR GUESTS. So, in a restaurant as an example, you would want the controller in the front of the house if possible. The closer the controller is to your guests, then the stronger the signal will be for your guests to connect to.
We recommend having a dedicated Ethernet wire run to the controller that connects directly to your ISP connection.