Manufacturers do not usually give information about wifi coverage, as it depends on many aspects, such as wireless signal saturation, environmental conditions, obstacles, installation site, etc.
As it is difficult to predict the behavior of the signal due to different materials, obstacles and other signals, it would be advisable to perform a test in situ.
Regarding the simultaneous use, it depends on the type of application that is given, this type of AP are designed to provide wifi coverage to smartphones, tablets and laptops. As indicated on the web page, the manufacturer has successfully tested it with 200 mobile phones simultaneously (in Wifi AC and 5 GHz band).
If it is for IP cameras that are going to be connected transmitting the video stream continuously, it is not the most advisable type of device, but even so and taking into account that it is normal for IP cameras to work in Wifi N and 2.4 GHz, depending on the distances and interference, we would recommend a limit of 3 or 4 cameras and not share the AP for other uses.