Is there ANY way to use a Material Instance Dynamic on a Landscape?

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Hi again,
i dont know what are the correct values to place in the two MIN MAX.
This is the scenario:
Landscape size 4033, Colormap texture size 4033x4033px.
Landscape is placed at XYZ: 0,0,0
One big rock with the material described in the photo (same texture).
Rock position XYZ: 100000 , 50000, -44000
Rock Scale: 1000

I got to move the image & scale it changing some values to 403300…
but dont get to center it.

In other hand I dont know if this could work with Foliage_Volume and Grass Systems inside UE4, as they are placed alternatively. Should need aditional code.