Review on 🛋️ Furniture with Concealed Degree Folding Brackets by James Dominick

They are very suitable for overlays. I used them as recesses and had to add a bit of stopper at each bottom corner to keep the door from buckling inward. Another seller has installation diagrams. The easiest way is to close it 90 degrees, position the closed door how you want it, and fasten it. That way you don't have to worry about finding the right gap.