You can check out melevsreef.com for a lot of sump layouts.
I'm not sure what you mean by overflow and underflow. My FOWLR tank is reef-ready, drilled and has two overflow chambers. Water is skimmed off the top, falling into the overflow chamber. PVC piping then takes the water down to the sump. The water flows through the sump and fuge toward the retrun punp which then returns water back up into the tank.
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