On mine the water catch tray has 2 outlets, the fitter can choose the best one for his fitting location and use the rubber bung to seal the spare one off.
Problem is, the spare one has a well where the water in it is always there, so on mine I used silicone sealer to block the channel feeding it, job done.
On another they had not installed it level, plus the drain pipe was kinked, so though not a lot out, but enough for water to lay in the tray, a bit of fiddling around did the job.. ????