A couple people mentioned hanging the filter up high, but didn't explain why. The reason is because you want to be exhausting the hot air accumulating at the top of the tent. Another very important reason is because you want the air to flow from the intake vents, at the bottom of the tent, and have that cooler, fresh air flow through the plants on the way up to the filter. This will help circulate the air through some of the less accessible parts of the plants, like below the canopy where the circulation fans can't breeze the plants. Note the difference between the two types of fans, both of which are needed. The "exhaust fan" is what the filter connects to. "Circulation fans" are the small fans you clip on to the tent poles, to breeze the tops of the plants.
Also, I wouldn't push the air through the filter. Pushing air isn't as efficient as pulling. Consider mounting the fan outside the tent. Fans generate heat, and it's better to not add any additional heat to a space you're trying to keep cool. It also doesn't take up any space in your tent.
I would hang the filter from the ceiling poles towards the front of the tent, where you can reach it. Then only have the filter connected when the girls start to smell. This will remove the load on the fan, which will keep the fan running cooler, exhaust the tent more efficiently, and extend the life of the fan and filter. I usually just keep mine connected during the last few weeks of flowering.