Create a box collider between two Vector3 Positions in Unity3D

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I’m trying to spawn invisible walls around my screen dynamically through script and so far I’ve managed to find the bottomLeft, topLeft, topRight & bottomRight Vector3 coordinates.

I wrote this method to create a wall but the orientation of the wall seems to be off:

void SpawnWall(string wallName, Vector3 startPosition, Vector3 endPosition, Vector3 center)
{
    // Create & center the wall between the start and end positions
    GameObject wall = new GameObject(wallName);
    wall.transform.position = (startPosition + endPosition) / 2;
    BoxCollider wallCollider = wall.AddComponent<BoxCollider>();

    // Adjust the collider size and position
    wallCollider.size = new Vector3((endPosition - startPosition).magnitude, wallHeight, wallThickness);

    // Make the wall face towards the center
    //Vector3 direction = Vector3.Cross(startPosition, endPosition);
    wall.transform.LookAt(center);
    walls.Add(wall);
}

Screenshot 2024-03-09 at 5.35.40 PM
Screenshot 2024-03-09 at 5.35.40 PM1920×1200 209 KB

The red, blue, green & pink lines on the screen are the boundaries I’m trying to create the invisible walls. These are the positions I’m testing with:

Vector3 bottomLeft = new Vector3(-13.80, 0.00, -6.82);
Vector3 topLeft = new Vector3(-17.52, 0.00, 13.02);
Vector3 topRight = new Vector3(14.43, 0.00, 9.41);
Vector3 bottomRight = new Vector3(6.38, 0.00, -9.10);

I would appreciate any tips or advice on this matter. Thanks!