ابن حجر العسقلاني
It is permissible to make the "qunut" before going into "ruku" (bowing), or it may be recited when one stands up straight after the "ruku". Humaid says: "I asked Anas: 'Is the qunut before or after the "ruku"?' he said: 'We would do it before or after." This hadith was related by Ibn Majah and Muhammad ibn Nasr. In Fath al-Bari, Ibn Hajar al-Asqalani comments that its chain is faultless.