c# – Placing a Prefab in Unity

So I am making a proceduraly generated dungeon, Ive got a algo that creates base of the dungeon out of cubes, it creates rooms, hallways and staircases. Once I had that I started to place prefabs on it (walls, floors ceilings etc.). I got stuck on a staircases, so basically Ive got 4 cubes (1×1) making a rectangle(2x2x1) and I need to place a prefab of a staircase on them, but I just cant do IT

How I am currently placing a prefab

   if (delta.y != 0)
                        {
           int xDir = Mathf.Clamp(delta.x, -1, 1);
           int zDir = Mathf.Clamp(delta.z, -1, 1);
           Vector3Int verticalOffset = new Vector3Int(0, delta.y, 0);
           Vector3Int horizontalOffset = new Vector3Int(xDir, 0, zDir);

            // Mark the grid as containing stairs
            grid[prev + horizontalOffset] = CellType.Stairs;
            grid[prev + horizontalOffset * 2] = CellType.Stairs;
            grid[prev + verticalOffset + horizontalOffset] = CellType.Stairs;
            grid[prev + verticalOffset + horizontalOffset * 2] = CellType.Stairs;

            // Place the green cubes for stairs (this places them in the grid)
                            PlaceStairs(prev + horizontalOffset);
                            PlaceStairs(prev + horizontalOffset * 2);
                            PlaceStairs(prev + verticalOffset + horizontalOffset);
                            PlaceStairs(prev + verticalOffset + horizontalOffset * 2);

                  
    // Calculate the position of the stairs prefab
    Vector3 stairPosition = new Vector3(prev.x + horizontalOffset.x, prev.y, prev.z +       horizontalOffset.z);
    stairPosition += new Vector3(0.5f, 0.5f, 0.5f);  
                            Instantiate(stairPrefab, stairPosition, Quaternion.identity);  
     }

this is the part of my code when the algo detects a change in elevation and places a staircase. It marks the 4 cubes as stairs cells and then uses PlaceStairs() to place the green cubes.

How do I get the direction in which the stairs are going and how do I place it inside the green cubes. Any help would be greatly appreciated <3

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