Shaykh Saalih Al-Fawzaan was asked:
What is the ruling on the one behind the Imam reciting the Fatiha before the Imam in the loud prayer?
“There is no harm for him to recite it during the times the Imam is silent. There is no harm if he recites it [al-Fatiha] in the time the Imam is silent before he begins his recitation, and the time which is after it, and before ruku’ and like this”
Faisal Ibn Abdul Qaadir Ibn Hassan