I have made various photo prints behind acrylic glass for the family. I wanted an almost invisible hanging system with a slight distance from the wall.
The wall mounting can be attached to the wall with one or two nails. The suspension for the picture is designed to be glued to the back of the picture with 19mm mounting adhesive.
The triangle must be aligned exactly with the center of the picture. The picture part has a guide so that it is relatively easy to hang on the wall.
So that it hangs parallel to the wall, 2 spacers are included for the two lower corners. These are also attached with 19mm mounting tape.
There are two different widths of the picture part, so you can also use larger pictures with more adhesive tape.
The picture still shows the first version of the wall mounting (with 3 mounting holes), but this turned out not to be necessary.
I created the design with Tinkercad.