When I incubated my shipped pea eggs, I incubated them on their sides, but their air cells were in decent shape. If you have any with super jiggly or detached air cells I think you might want to start them off upright.
Pea eggs don't ship well, so you're up against that, but if the eggs are fertile, and the air cells aren't too damaged, you might get lucky. I did get lucky with the first set of shipped pea eggs, 4 of 6 hatched, but my next two sets of 6 eggs each, none hatched.