Mashalla...First of all v.good to hear of your high and great intentions..May Allah swt reward you for it.... For becoming a hafizul Quran you can put your son in any tahfeez for memorizing the holy Quran...and these tahfeez are located in different masjids areawise...I can advise the best tahfeez where I memorised the Holy Quran in Mohamed bin Jaber Al Thani Masjid where our Teacher was Sheikh Farooque..whose tajweed,guidance,hardwork on students I feel the best compared to other tahfeez....One of the best reciter of Quran(Qari) in Qatar...,if you go to salwa road from ramada signal after jarir bookstore and before the bridge theres a right cut...turn right and go straight you will find a big masjid...and you can meet him in any prayer time as he is The Imam there.