Align rotation when using ScreenToWorldPoint

I'm using ScreenToWorldPoint to position some gameobjects on one side of the screen. The problem is that they are not aligned corrected because the camera is rotated.

As the can see in the game view in the lower right, the cubes are off to the bottom of the screen, and they are not rotated to look at the camera.

How can I get the rotation to align with the camera?

Here is the relevant code:

 Vector3 worldPoint = Camera.main.ScreenToWorldPoint(new Vector3(Screen.width - (Screen.width/6), 10, 10));
 GameObject temp = Instantiate (cube, worldPoint, Quaternion.identity) as GameObject;
 temp.transform.position = new Vector3(temp.transform.position.x, temp.transform.position.y-(index*offset), temp.transform.position.z);
 temp.transform.SetParent(screenParent.transform);