Sump: over/under/over? or the other way?

[MikeInToronto]

I only have 3 pieces of glass for baffles for a bubble trap. I've added 2 and now I don't know where to put the last one. Am I supposed to have over/under/over like I've been reading or is it under/over/under?

Like I said I only have 3 baffles so even though 5,7,9,101 might be better, what's the right configuration for 3?

Thanks for help. I included drawings of both.