We have an almost identical set-up so heres what I did with mine.
I've got a PH
on the back wall in each corner about 2" in from the sides, aimed slightly downward and to the very front of the sides.
In the center is my HOB
power filter. I siliconed two strips of acrylic to the output to direct the water off the sides in both directions.
I had the option to test it before I put the tank to use. I used 2 different food colorings. Started it with red in one corner, blue in the other and fired it up. I watched as the PHs pulled it through and spit it out towards the corners. From the corners it spread out in all directions a full 90 deg from the corner.
In under 5 sec the HOB
was pulling in the red and blue and spitting out purple water. I could then track the water outlet from the HOB
it was everywhere in under 10 sec so I was quite pleased with the set-up. Just off center and a bit forward was a very agressive mix which could prob please any coral.
Your motion isn't real important in a FO
tank, just make sure you get circulation everywhere. This will it do it for you, as well as support a future expansion for possible corals and such.
sorry so long HTH