I've been the slack-jawed yokel (outside). Its' easier than you think. Knocking it over is one way, here's another:
You lower the turkey in (slowly) and the water in it's meat causes the oil to get violent. The hollow chest cavity concentrates the steam and boiling oil comes shooting straight up all over you. In fear (and pain), you drop the turkey into the pot and run. Now fully submerged, the hollow carcass becomes a hot oil fountain spraying as high as 8ft. The superheated airborne oil droplets ignite from the flames, subsequently igniting the pot. Quickly, the whole pot and all flammable materials around it become an inferno.
Fortunately, we has sense enough to be in the driveway and keep a big extinguisher handy. Had this been in a garage, on a deck, or close to the house, it could have been a disaster.
So, unless you'll be boiling flammable wort it should be ok. But do keep an extinguisher handy just in case and be very aware of the danger of tipping over a boiling 5 gallon pot. My biggest fear in this respect is an overly playful dog and little ones who are unaware of the dangers.