eheim splash bar placement

Hello,   I just set up a new Ehim Classic Canister 600 (formerly 2217) for my 55 gal. I am not sure how to set up the splashbar.   In Tank: unplanted and I will be putting in platys, guppies, tetras.   I have it sitting about 1.5 inches below the water level on the back of the tank in the...