Do i read the sunnah rakkats in the mosque

Asalamualykum, Hi i wanted to know, when i go to the mosque for a prayer eg maghrib. "Do i read the 2 rakkath sunnah in the mosque before the 3 rakkath farz or after the 3 rakath fard or do i just not read it in the mosque?" I know how to read all the namaz at home but i wanted to just make clear i know everything so i can attend the mosque as it is much more rewarding. Also do i do the same for all of the other salahs fajar, duhur, asar, and isha