I am going to place all three in corners. My idea is to create a humidity/moisture/temperature gradient across the cage. One side will have three nozzles (the double and a single) and there will be another single nozzle on the other end of the cage. The side of the cage that has the heat lamp will get one nozzle, while the side that doesn't will get three. This makes the area with the lamp hotter and drier, and the area on the other side colder and wetter. From what I have read, thermoregulation is made easier when there are gradients like that.