What is the ruling on reciting Al-Fatihah for the soul of the Prophet, peace and blessings be upon him, and the souls of the deceased, and is there a specific method for that?

The reward for righteous deeds reaches the Prophet (peace be upon him) without the need for it to be dedicated to him, because he who guides to good is like the one who does it, and every good that occurs from his Ummah is due to his guidance.