It is recommended to wall mount the iPad and also use an iPad Case/Cover.
Mount the iPad keeping the following in mind.
Mount Height: The iPad(s) should be mounted at different heights so that users of all heights can verify their faces using the iPad.
Power Source: The iPad must be mounted such that it can always be plugged into a power source.
Lighting: Ensure proper lighting so that well-lit images may be captured.
Sturdy Mount: The iPad must be mounted on a sturdy platform so that steady images are captured.