Here is a picture of my pistons running 4x 0.4mm C-type aquamist jets behind the fuel injectors.
Here is how it looked like right after popping off the head:
You can clearly see where the water/methanol injection from the direct port injection nozzles reduced carbon build up and cool the critical spots. it is pretty uniform and on both intake and exhaust side. this shows that the spray passes both the intake valve's rear and front. with the nozzles on top of the runners in the past did did not happen.
The spray followed pretty much the fuel spray with the bigger droplets hitting the piston and cylinder walls front and rear as they cannot make the turn back horizontal with the swirl.