Air holes in tubs???

OKay I bought a 41 quart steralite tub, and I wondered where should I put the air holes?? On the top, side, or near the bottom of the tank? Also how many should I put???

I would put them on the sides about 6-8 holes on the top....

put them on the side closer to the top just in case you want to stack the tubs in the future:)