ai sol light setup

[rocksteveo]

im considering get ai sol leds, my question is my tank is 48''l 18''w and 30'' d with a center brace, im think of getting 3 of them but i dont want to install them high above tank cause where my couch is im gonna get the light right in the face, now will 3 be good 3 inchs awl with center brace?
or would 4 be better running them perpendicular?