How to make sure the view is covered on different screens.

This is a very basic question.

In my game neither the object is moving nor the camera. I want to make sure that certain objects are at the edges and the corners of the screen. The game will run on different screens, how can I make sure that irrespective of the screen size, the objects are placed at the edges and corners of the screen? Where should I place them in my game?

Use a canvas set to scale with the screen: Redirect to... title of new-page