Map1.cs

private Mapper _player;
private Dictionary<Transform, RectTransform> _images = new Dictionary<Transform, RectTransform>();

[SerializeField]
private GameObject _elemTemplate;

public void PaintNewElement(Mapper m)
{
    var o = Instantiate(_elemTemplate);
    o.GetComponent<Image>().color = m.color;

    if (m.isPlayer)
    {
        _player = m;
        o.transform.SetParent(transform.parent);
        o.GetComponent<Image>().rectTransform.localPosition = Vector3.zero;
    }
    else
    {
        _images.Add(m.transform, o.GetComponent<Image>().rectTransform);
        o.transform.SetParent(transform);
    }

    o.transform.localScale = Vector3.one;
}