Prior to installing and configuring the Customer Not Present (CNP) plug-in, you must first install and configure the Dwell plug-in and an appropriate PoS plug-in.
Each PoS device requires a camera configured with the Dwell plug-in. Overhead cameras are strongly recommended. If a camera cannot be placed directly above the PoS device, care must be taken to avoid both foreground and background obstructions in the customer zone.
Refer the https://identivdocs.atlassian.net/wiki/spaces/HSA/pages/80150728/Dwell+Installation+and+Configuration#Getting-Started for general environmental specification information for
the Dwell plug-in.