Adding circulation/flow to a tank

[kdx7214]

I've got a 75g Aqueon tank. The back glass is drilled and there are two loc-line returns angled as shown in the image (pardon the terrible paint skills). I have a single Hygger circulation pump that I can add in the tank pretty much anywhere. There is a wall of rock inset from the back wall by about 3" (top of image is back wall of tank - it's a top down view). The yellow area is the dead zone I'm trying to fix.

Where the heck should I put the darn thing? I don't want to move it around too much as I don't want to disturb things any more than I have to.

 

[sfin52]

Blue is another dead zone. Dark red X is where I would but power heads. I would also point the returns toward the front glass.