Yes, always flip your raw file vertically - the areal texture is projected from the top down, the height map "pushes" the terrain from the bottom up.
Caution: In Unity, height map raws need to be - for whatever idiotic reason - of a (power of 2) +1 resolution: That gives you a choice of 125, 257, 513, 1025, 2049 or 4087 raw sizes. The recommended raw resolution for course forge is 2049, make sure that your raw is a perfect square of 2049 by 2049 pixels.
The actual terrain size in Unity world units aka meters can be anything, but has to be a perfect square as well.
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