FreeMeshX 2.0 is designed to be a "base" layer, meaning it sits underneath your other scenery.
version exists, providing sharper terrain specifically for that region. FreeMeshX Global Terrain Mesh Scenery 2.0 for FSX & P3D freemeshx global terrain mesh scenery 2.0
If you experience stuttering when looking left/right at low altitude, reduce your “Mesh Complexity” slider in Graphics Settings from 100 to 85. This tessellates the mesh slightly less aggressively without losing the macro detail. FreeMeshX 2