Question Responsive Instantiate UI GameObject

Hi. I have a Grid with Tilemaps in the scene, which I have divided into regions by coordinates through code (a regular List<object> where there is a start and end position). So through UI I want to make it possible to see these borders. I made the code and it works, but only on one screen resolution. How can I make these borders look the same on all screen resolutions?

Code where i created ui gameobjects for coordinates:

GameManager:

Code (CSharp):

1. void Start()
2.     {
3.        
4.         List<WorldRegionPositions> worldRegionPositions = new();
5.  
6.         foreach (var item in _levelEditorData.Regions)
7.         {
8.             worldRegionPositions.Add(new WorldRegionPositions(
9.                 Camera.main.WorldToScreenPoint(_levelEditorData.LevelGrid.CellToWorld(item.StartPosition)),
10.                 Camera.main.WorldToScreenPoint(_levelEditorData.LevelGrid.CellToWorld(item.EndPosition))));
11.         }
12.  
13.         _levelUI.CreateOutlineRegion(worldRegionPositions);
14.     }

LevelUIManager

Code (CSharp):

1. public void CreateOutlineRegion(List<WorldRegionPositions> worldPositions)
2.     {
3.         foreach (WorldRegionPositions positions in worldPositions)
4.         {
5.             GameObject tempGameObject = Instantiate(_outlineRegionPrefab, _canvas.transform);
6.             tempGameObject.GetComponent<RectTransform>().position = new Vector3 (positions.StartPosition.x - (-122.5f), positions.StartPosition.y - (-104));
7.         }
8.     }

How looks in my screen resolution and how it looks on other resolutions: