I want to place a wood-fired pizza oven directly over an outdoor fireplace. Suggestions?

Just one suggestion… Go stand in front of a roaring fireplace - and make sure your crotch is mere inches from the fire…

That same burning sensation can be had by building your wood-fired oven over a fireplace. DON’T DO IT!

This is why almost every Pizza Oven / Fireplace combo you see on Google has the pizza oven to the left or right of the fireplace.