While that seems to make sense, water pumps are designed to push water rather than pull it so this is how you typically set up these filters. Apparently, if you place the pump after the filters you get cavitation.
Also, I'm using Nu-Clears instead of Ocean Clears. They are similar filters but the Nu-Clears have a number of advantages (1" hose plumbing, better sealing mechanism for the lid and easier to clean filter cartridge). The construction quality is excellent - much better than your average aquarium filter. They do require a little more plumbing work to set them up in comparsion to the ordinary 'plug and play' canisters.