There is ZERO need for them to be directional. The flow is so broad that the whole tank receives flow.
Except the spots toward the back of the tank behind rock work. I have a tunze on the back wall pointed sideways.
the only way the water flow is going to go straight up is if you put you vortech on the bottom of your tank and aim it straight up.
why exactly would you want to do that???
I suggest you go to the website and see what this pump can do.