During regular season, captains are required to exchange their lineup 5 minutes prior to the start of the match. The peeking order should be the strongest pair anchors the first doubles and on down, to ensure a competitive game. Each match win carries different points:
First doubles win is worth 6 points
Second doubles win 4 points
Third doubles win 3 points
Stacking will still work (like putting your first to play third) if you think you would loss all three matches. But in playoffs since only the winning match counts, so you would want to place your weakest against their strongest if you feel your first doubles isn’t going to win.