Useful strategy to manage "unlimited" cameras in Unity 3D

CameraTimeSharing.cs

// Source: Archimagus on "Most efficient way to incorporate CCTV screens in Unity?"
// https://www.reddit.com/r/Unity3D/comments/2z7u4c/most_efficient_way_to_incorporate_cctv_screens_in/cpgql85

Camera[] _securityCameras;
void Start()
{
    foreach(var s in _securityCameras)
    {
        s.enabled = false;
    }
    StartCoroutine(UpdateCameras());
}
IEnumerator UpdateCameras()
{
    while (true)
    {
        for (int i = 0; i < _securityCameras.Length; i++)
        {
            _securityCameras[i].Render();
            return null;
        }
    }
}