Exactly. If you just mak a small area in a front corner where you can sneak a hose in then you are all set. I have one where I can just lift the corner enough to slip a hose in, then siphon it on occasion to remove the excess water. Usually a 1 1/2 to 2 inch deep area below the eggcrate is enough.

Depending on how often you mist will determine how often you have to drain this area.

If you build in a pump and have a hose coming out to attach to you need to make sure the pumps suction is at the bottom and not sucking in water from the side.