Hydra 26 mounting questions

[Gobi-Wan]

Hi all. I am upgrading to a 125 and built my stand and a wall-mounted lighting canopy. I built a wooden rail system in the canopy for mounting. I have 3 AI Hydra 26HDs on order and I need to know if I need to order any mounting hardware. Could I get some opinions on the easiest way to mount them in my canopy? Thanks in advance!

 

[Gobi-Wan]

I should say, the bottom of the canopy is 6" above the aquarium, and the mounting rail is 18-19 inches above the future surface of the water. I have read that hydras spread best higher above the water. However I do not want to see obvious shadow bars beneath the 2 top braces of the aquarium which is why I decided on 3 2-foot spread lights.