Interesting test render.

Now try this: select the flat plane, open the Grouping tool, create a new group (name doesn't matter) and select about half of the polygons. Choose "Assign material" and enter a new material name, e.g. "Flat"

Now the plane has two materials, one half has the "Flat" material, the other half has the "Preview" material.

Set up the displacement shader for the Preview material as you did, and leave the "Flat" material as it is.

Render, and you'll see that the "Dimple" will neatly line up with the "Flat" part of the plane!

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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