It can be done in different ways.
One way is to use the Axis Occupancy Estimator together with Axis Occupancy Alert. Which give you possibility to sync occupancy to one master camera and with Occupancy Alert set targets and show different web pages depending on level of occupancy.
This webpage can then be viewed directly on the tablet or professional screen browser.

Here is information about Axis Occupancy Estimator (requires 1 license per camera):

The Axis Occupancy Alert application is a free “as-is” application from Axis Solution lab, and can be downloaded from github.

Axis Occupancy Alert application:

Information about Axis Solution lab:

Axis people counting cameras, together with other brands can be integrated in ApexCount People Counter cloud.