[rotrex]

I'd second that. The fuel injectors are a good guide.
Spraying at an angle might give you a better distribution across the cross section of the runner.
I'd position them right behind the fuel injectors above that vertical pipe. So well above the red dots.
I'd avoid that the spray has to take any bends.
Instead of using only 50% of spray, I'd rather choose smaller jets. Droplets are the smallest near max flow.