Hang the scrubber from the ceiling and run it next to the lights, wont take up any room - It'll grab more heat and promote better airflow, butmay shorten the life of the carbon/kitty litter though. Nothing smelly exhausts from my room, just warm de-stinkified air.

As said earlier, most good fans tend to work a little more efficiently when sucking through a restriction, rather than blowing through one - which is why most of the time the scrubber is on the suction side. You CAN blow through them as well (I have), but may be compromising the cooling of your light and the airflow in the room. If blowing through a filter I'd say go one fan size up