a little extremely simple logic applying Stinky and ashtray and adding a dot com on the end provided me with the following result.
http://www.stinkyashtray.com/
I know a lot of guys have them, and with the history of stirrups snapping off when knocked over and the addition of me being clumsy, I would be in trouble with one on a stand, and the apparatus able to clonk into the floor from a couple feet up.
With careful use, and no excited dogs running about underfoot, I imagine either option would be acceptable. They are nice and deep, and for outdoor use, would be good for not having ash fly out with a slightly stronger breeze.