Zscaler's Advanced Persistent Threats Solution is the first cloud security solution built from the ground up to protect users accessing the Internet from any location, on any device. Zscaler's Advanced Persistent Threats cloud security solution leverages the Zscaler Direct-to-Cloud Network, and is based on key patented technologies and approaches that clearly differentiate it from more traditional security products.
Like others have said, get a RUP\AUP in place as well. We use ZScaler on prem and with our road warriors.