Has anyone tried inserting a hop back into the immersion chiller whirlpool set up using the March 809

I am thinking about adding a hop back to my system, but am unsure about where to put it

I really like my IC whirlpool set-up and I don't want to change from it. I am thinking either to gravity feed into the hop back from the kettle and pump out of the hop back through the return on top of the IC. I was also thinking to maybe put the hop back between the kettle and the fermenter. Which is the better idea
