Positioning of the egg in the incubator?

I'm sure the answer is somewhere on this site in numerous places, but I haven't found it. I have a homemade incubator, I added some upgrades to it. The one upgrade is the automatic turner. I bought it used, so no instructions. I has eight prongs for each egg. Four "outside" a 1/2" higher than the "inner" prongs.
My question is How do I position the eggs? Narrow end down? I don't know if there is enough room between rows to lay them on there side.
Also, some of my eggs are xl or jumbo sized. I'm wondering if I should just do it manually...

 

You know, I read that whole article about 2 hours ago and missed the "or upright with egg turner". Well, to be honest, I get side tracked for a while with the thread on the lady incubating eggs in her bra... which lead to one thread to another.....
Anyway, Thanks!
Do you have a thread going, or one you follow? I just signed up yesterday. Didn't even finish my profile yet...