Hi Draden, you're right that the documentation has a method of setting widget location dynamically in the development environment.
However, this is only a useful tool in development, to see what these widget locations look like in practice. During deployment you will specify the widget location as one of the configurations needed.
If you need to test the widget location in the mobile app during development, your best bet is mobile emulation via the browser. It should be close enough to test the look and feel.