Easy sniping spots:
There are two ways to do this. You may select a Jet Trooper and climb up the temple-like steps. You can also climb with a Clone Sharpshooter. Doing this can get you good sniping spots. You may also use any sniper rifle carrying soldier to get on a speederbike. Ride it as far as you can up the side of the temple, and when it slows down, hop off and start sniping.