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.
Weber 26.75 OTG w/CI grates & SJ/WSM Mini
Home built 24"x72" reverse flow stick burner trailer with 18"x44" grill w/CI grates and upright SS gas oven/smoker.
Home built 48" fire pit with a 30"x30" Santa Maria style ranch grill.
Home built lump charcoal retort, iGrill & a bunch of other cooking toys.