Inside the Kaaba: Hanafi law validates both obligatory and voluntary prayers; other reported positions differ on obligatory or internal prayer.
Three internal arrangements: Back-to-back valid; face-to-face valid but disliked; a follower ahead with his back to the imam’s face invalid.
Circular rows: Precedence on the imam’s side is disqualifying; greater proximity from another side alone is not.
Roof: Hanafi law affirms validity, while reverence is a separate matter.