Position with ball in the air

[DaveASA/FED]

Ok, I have had conversation with several people but was wondering what you all think. Where do you stand as the down official when the ball is in play? I know when the team is about to serve you are on the recieving side. But when play is going where do you stand? I have always been on the side with the ball so I can observe the attack and make sure it is clean (no contact with the net, but feel like I might miss an aggressive block that is in the net. You can't be two places at once so what are all your thoughts??