I was just pondering this late yesterday! I have mine on an upturned bucket and sometimes it gets off kilter and the water all runs out. They have another waterer but I like to keep two sources just in case of mal function when there is a larger group using it.
I also have a couple of the five gallon waterers that can barely be carried through narrow doors and the best way I've found to elevate those is by setting it on plastic barrel top. They cut the tops off of plastic barrels at the feed store to make water barrels out of the big end. I don't know what they do with the sawed off tops and would never pay for one, but I have a few I have scrounged from here and there and they are perfect pedestals for the oversize five gallon plastic waterers. They are about eight inches tall, and the lip of the barrel top is about three inches wider all around than the base of the waterer and if the chickens do feel the need to hook a toe on the edge, they just step on the side of the barrel and not in the water mainly.