I agree with the bi-directional spray bars. Im currently running 2 eheim 2213's on 2 tanks but there both going onto one tank shortly.
The way il be setting it up is having both a vertical and horizonta; spray bar per cannister. one side of the tank will have a horizontal and vertical covering one half of the width and the front of the glass, and the other side the opposite.
Iv got 4 spray bars in total.
They are being connected together using bends iv bought from a plumbing merchant, ones a t shape the other a 90degree bend. This will both regulate the strength of the current and also make it bi-directional.
The intakes re going to be at different heights aswell, one around half way and the other deeper also at opposite corners of the tank.
Im not worried how they will look as there will be plants and hardscape cincealing them