Yes, any method will work. It's just some people get so confused, so it's easier to move them all in one place.
I found it easier for me because when they were placed randomly over the board I would end up clicking the wrong plant.
I will try the other methods too, whatever is the fastest. Today it was tough for me because I kept getting a plant that wouldn't move.
I just HOPE the amount of clicks doesn't count for towards the end prizes! Because moving them all to the top will definitely cause more clicks.