As mentioned, here is a file based on your panel/profile.
The file "01 " produces the smallest displacement square, and even in 32bit/channel/float, it is relatively small.
Please note that the depth information is based on a Gradient set to Linear and projected from the side, with no baking!
The "11" file contains a Redshift 3D setup with the displacement map.
In many cases, the fastest method, while it works with all geometry, must not be only Polygons. That is one of the many advantages.
However, I encourage you to explore the creation of such maps in Photoshop; it has so much potential.
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