How do you get a minimap to stay rooted to the top left corner of the screen despite resolution changes?

I can see how this would work but I do not know how to attach the texture to it, is this possible?

Can someone please clarify this answer?

If I have a $$anonymous$$ain Camera and I place a $$anonymous$$ini-$$anonymous$$ap or a Picture-in-Picture camera that I want anchored in the top left (or right) I set the second cameras view-port Rectangle and then I attach a script like the one in the scripting reference:

 using UnityEngine;
 using System.Collections;
 
 public class Example : $$anonymous$$onoBehaviour {
     void OnDrawGizmosSelected() {
         Vector3 p = camera.ViewportToWorldPoint(new Vector3(1, 1, camera.nearClipPlane));
         Gizmos.color = Color.yellow;
         Gizmos.DrawSphere(p, 0.1F);
     }
 }

using (0,1,camera.nearClipPlane) for left top or (1,1,camera.nearClipPlane) for the top right, I still end up losing the edges of the $$anonymous$$i screen when moving the game window size in free aspect mode.

Any help clarifying this would be greatly appreciated.

I found THIS was much closer to what I needed.

 using UnityEngine;
 using System.Collections;
  
 public class $$anonymous$$y$$anonymous$$inimapResizer : $$anonymous$$onoBehaviour
 {
 private float itsWidth;
 private float itsHeight;
 private Camera its$$anonymous$$inimapCamera = null;
  
 // Use this for initialization
 void Start ()
 {
 its$$anonymous$$inimapCamera = GetComponent();
 }
  
 // Update is called once per frame
 void Update ()
 {
 itsHeight = 1.0f/3.0f; //set the $$anonymous$$imap height to 1/3 of the screen
 float itsScreenHeightInPixels = Screen.height*itsHeight;
 float itsScreenWidthInPixels = (itsScreenHeightInPixels/9.0f)*16.0f;
 itsWidth = itsScreenWidthInPixels/Screen.width;
 float anX = (1-itsWidth)/2.0f; //centers the $$anonymous$$imap
 its$$anonymous$$inimapCamera.rect = new Rect(anX,0.0f,itsWidth,itsHeight);
  
 }
 }