You want to know if you can roll out the DLP Endpoint Agent via the DLP product to a mass/large environment.

You cannot do a mass/large rollout installation from the DLP product, for mass installation using a Symantec tool you may use the Symantec Management Console (SMC) which is an Altiris component.

The DLP Agent is already packaged with the Altiris Management Agent for installation rollout and management.

Please read your Installation Guide for more details and also the documentation about Symantec Management Console.

References:

About the Symantec Management Console 

How To: Install Endpoint Agent without using the Symantec Management Platform, or the Altiris Agent

What are the prerequisites for installing Endpoint Agent on a machine?

Can I upgrade DLP Endpoint Agents using the Upgrade Wizard?

Symantec Connect Forum:

Installing the DLP Endpoint Agent with Altiris

DLP and the Altiris Integrated Component