How do I centre a non-tiled texture onto a Landscape object?

I want to create a texture that I need to place in the centre of Landscape object and I want to precisely align it there and size it without tiling it. Note the texture will likely be built in an outside editor, so I don’t want to paint it or compose it in UE out of different textures.

I figured there might be two or more ways to centre a texture on a landscape object:

  1. Get the resolution of the landscape in pixels and create a texture for that resolution which then can be mapped onto the Landscape.
  2. A better way?