First, that's a really nice deck and patio (and from what we can see a nice house), you and the spousal unit should be proud of what you have put together. Be a damn shame to have an avoidable accident. If it were mine, I'd figure out some way to get a fireproof base to my cook toys (concrete) with at least a 3-5 ft perimeter to anything that could melt or burn. Maybe move to the "patio" area and add some kind of cover to keep that white chit off. But I acknowledge I'm one of those guys that have had a grease fire or two after 40+ years of outdoors cookin so I'm kinda parinoid about fire.
Got a bunch of cooking toys and a custom metal fabrication shop where I spend my time building all sorts of smokers & outdoor cooking gear.