There is a better way, get a pump and some tubes and place the tubes in the trays, after about 20/30 minutes after watering turn it on and it will suck the water into a disposal container.
Hope it helped, if you have automated irrigation you can just time the pump to that time after the watering.
Hope it helped and if it did plesse pick my answer its for grower of the month contest. I really would appreciate the fastbuds merch they have as a prize .