Dish rack cabinet should always be at least 4 inches down from the top cabinet. But not too low or it will hit your head or those with industrial taps cannot be installed.
Look at what my contractor did as shown. He also streamlined the LED under the dishrack with a light palmet and with his original abstract art glass, wow ... so beautiful! No IDs can do this locally and I have checked. All my friends and relatives loved this. Overall, I renovated my kitchen and I am very pleased.