I just drilled a 1/4" hole for now. @caliking, I like your idea of a notch and not having to feed the wires through. Thanks to everyone that replied!
Charbroil Vertical Propane Smoker, Weber Silver Gasser, UDS, Maverick 732. Weber 18.5" Silver, Weber Redhead Stainless Performer, Blue Weber 22.5 Gold, 18.5" WSM