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Here's a picture ledge project:
https://www.hometalk.com/diy/decorate/rooms/how-to-make-a-diy-picture-ledge-39797717
How to Make a DIY Picture Ledge
If I were going to do this I would buy a length of molding that had an edge to it, to support the art.
FYI, Ikea sells these for cheap! I just did a whole gallery wall in a client's home with these MOSSLANDA ledges. There are other styles and lengths available too. https://www.ikea.com/us/en/p/mosslanda-picture-ledge-white-90292103/