I can't adjust the height with my setup but 11 inches over the water worked out well. These brackets are a little overkill, I could have printed them thinner and in two halves and they'd still be fine. I think when I do the bank of four over the lowboy I will design a sideways sliding setup.I used the eye bolts that came with them and simply hung the with decorative black chain.
I know @kharmaguru 3D printed brackets for his.