No idea what plugin you are using.
Best way to make a still is to place an actor/decal into it.
If you want real displacement you have to make a special material where you move a texture in world splace to wherever you wish in order to control the localized WPO.
Easily done with any old ststic texture placed at actor coordinates via material parameter collection node.
For the displacement you can use any displacement map you want, but id sculpt one in blender and bake out a heightmap from it to use as the texture in question…