At least one Gateway must be installed at each site. This is necessary to establish communication between the on-site controller and your applications in the 'My Priva' environment. If only one Gateway is installed at a company with multiple sites, it is only possible to control the site with a Gateway via applications such as Priva Operator.
For a proper use of the Operator there is a maximum number of controllers to connect to a Gateway. For Priva Connext is the maximum number of controllers 3, for the Compact CC it is also 3, and for Compass it is 5.