Yup, pointy side down.
They can hatch fine lying on their sides or upright, it doesn't really matter. But if they were on their sides AND in cartons they might have problems zipping all the way round their shells. I've hatched eggs lying flat on the floor of the bator and upright sitting in cartons, and I don't really notice any difference in the hatch rate. The whole point of lockdown and not turning the eggs for three days is to allow the chick time to manoeuvre itself into the hatching position, so as long as you don't move the egg, upright or lying on its side are both fine.
I now prefer carton hatches cause it keeps all the eggs sitting still and newly hatched chicks can't play football with the unhatched eggs.
Good luck with your hatch!
