Question Unity Canvas Change resolution

Hi, I'm using this code to make an object appeared in any part inside a Collider2D, but the problem is that i cannot make it responsive, because if I added CanvasScaler then appears as too small, and object get out of the Collider. Is there a way it can resize with canvas size without making so small? Any idea on Canvas Configuration?

Code (CSharp):

1. public BoxCollider2D gridArea;
2. private void RandomizePosition()
3.     {
4.         Bounds bounds = this.gridArea.bounds;
5.         float x = Random.Range(bounds.min.x, bounds.max.x);
6.         float y = Random.Range(bounds.min.y, bounds.max.y);
7.         this.transform.position = new Vector3(Mathf.Round(x), Mathf.Round(y), 0.0f);
8.             }
9.     private void Start()
10.     {
11.         RandomizePosition();
12.     }
13.     void ChangePosition()
14.     {
15.         RandomizePosition();
16.     }
17. }

If I added Canvas Scaler, and Add Scale with Screen size, it only works if i do it in bigger than 2056x1440 but not working in 16x9. And if i change Canvas properties to Constant Pixel Size it works but not responsive, any idea? The issue is the Box Collider is changing size all the time and I need that it stays the same all time