I never hatch upright. I incubate upright, but I lay the eggs down on their sides to hatch. Interesting, there have been studies done that show that the chance of some malpositions is actually higher when they are incubated in the traditional horizontal position as opposed to vertical. Kind of weird, right?
Well, actually, when you consider how many (chicken) generations people have been incubating eggs in a vertical position...
Not that I'd thought of that until just now (and probably wouldn't've thought of it now if the link to the contact incubator didn't mention how poultry have been self-selecting for hatching well in incubators).