The proper positioning of your Video Doorbell Wired depends on your installation choice, and whether you'll be replacing an existing doorbell or not.
Seeing the world two ways
Your Ring Video Doorbell sees the world in two ways. First, the camera on your Video Doorbell has a very wide view of the world as illustrated below:
One of the biggest mistakes people make is mounting their Ring Doorbell too high in the belief that they need to do this in order to catch people's faces. In fact, as illustrated above, viewing faces is not a problem if the Video Doorbell is mounted at the correct height of approximately 1.2 metres above the ground.
The second way your Video Doorbell sees the world is through a network of PIR or "Passive Infrared" motion sensors. These are heat sensors that detect motion by monitoring heat within the detection area. Since people are hotter than the surrounding areas, as a person enters the detection area the heat measurements change. The motion sensors register this change as movement and send out an alert. As illustrated in the image below, the motion sensors have a much more focused field of view than the camera:
The motion sensors in your Video Doorbell are designed to detect motion up to 155 degrees horizontally and from 1.5 to 7 metres outward from the fixture. They're also more sensitive to horizontal movement across the detection area than vertical. Mount the Video Doorbell too high and you're more likely to catch the heat of passing cars than the heat of incoming visitors.
Now that you understand how your Ring Video Doorbell sees the world, positioning it properly becomes much easier.