When we are the receiving team in doubles, when our partner is the one being served to, I think most of us straddle the center line (i.e., one foot on each side) about 1-2 ft. in front of the T. This is based on the assumption that the partner will make some kind of aggressive shot and stay at the net. If you have a partner who lifts to the back all the time, you may position yourself on the other half, already in a defensive position. The point is, the receiver's partner should position him/herself in the best position for the return, so I just can't see any benefit for both players to stand on the same side. I have seen some unorthodox things, though. I've seen mens' and ladies' doubles teams where one player was so much better in the back and the other was so much better at the net that they played mixed style. I've even seen matches involving kids where two players were assigned together, but their levels of skill were so disparate that, for the sake of winning, the better player had the partner only play the serve and then basically stay out of the way, playing one-on-two during the rally.