Flow in cube 18x18x18 aio

[necbov]

Hey everyone, after a few months I added my first corals (1 or 2 per week small frag). Right now it’s on the sand bed till they find positions on the rock. My question is what’s the best position for 2 Wavemakers DD4000L. you can see my tank. As you see my nano tank
Return pump nozzle rfg is looking up and left (towards the middle). Wavemaker on the right looks slightly up and right (looking towards the center and left Wavemaker loooking left ( looking towards middle)

 

[Mr. Mojo Rising]

I point my powerheads upwards (to get surface agitation) and directly facing each other, so the flows meet and bounce and create random flow patterns,.

 

[necbov]

I point my powerheads upwards (to get surface agitation) and directly facing each other, so the flows meet and bounce and create random flow patterns,.

Do you suggest to be exactly opposite ?! Or how I have them now ?! Like to face each other direct (slight upward) or how I have them one each corner and try to face each other ?