I cringe when I look at pictures like that. Having cookers with live fire inside them puts you one mishap away from burning down your house. It's one thing for grilling where you are going to be tending the cook and right there, but for smoking this thing will be there a long time w/out close supervision, perhaps even overnight while you sleep. I can't speak for you but a layer of brick on top of the deck would not be sufficient for me.
My suggestion - not what you want I'm sure - would be steps as close to the back door as possible to take you to ground level where you could situate cookers in absolute safety.