وعليكم السلام ورحمة الله وبركاته
According to the Ahnaaf, the
Asahh-ul-Qowl (most authentic view within the Madh-hab) is that during Tashah-hud, the gaze of the Musalli should be on his lap. This is mentioned by Imaam ibn `Aabideen ash-Shaami in
Radd al-Muhtaar `ala-d Durr al-Mukhtaar under the chapter of
Aadaab as-Salaah.
والله تعالى أعلم
والسلام