I use 2 x Atman CF-1200 on my 4x2x2 planted. One unit is 1550L/HR, so 2 units makes 3100. I've stuffed so much media inside, some ehfi mech and lots of substrate pro and just a thin layer of filter wool. The flowrate definately slows down quite a bit, maybe slightly more than half of what its suppose to be.
Hope you don't mind me adding this, why not you save the $, one 2028 is enough to buy you 2 Atman cf-1200 filters together with good bio filter media. I personally find Atman filters value for money. It comes with 1 year warranty at NA and the spare parts are available at NA too.
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