What kind of dog crates? In my experience they escape through the wire of dog crates very easily if they aren’t past a certain age/size. And plastic airline type dog crates don’t have a large enough footprint to hold the heat plate and still leave room to walk around. I abandoned that method long ago.
I cut out the lids of the totes and attach wire on them in two sections. One section is fixed and the other opens and closes for access. I suppose it would be just as easy to make both sides open and close.
I also have two rabbit cages that are my favorite. Plastic on the bottom to hold bedding in, wire on top to hang feeders and waterers from. Like you said, more ventilation, and also more light. One has legs and the other is on a stand. Elevated is the way to go!
I usually start new chicks out in the totes and as the older chicks in the rabbit cages graduate out to the coop, move the next oldest tote chicks to the rabbit cages.