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This idea is out there but I have seen a couple shots where they drill a hole INTO the canister filter running wires for a submersible light. They put the fuge in the canister using the canister pump for water motion, live rock, and cheato. Then they clean it out every now and then.
Another thing if your able to put a sump in a basement or behing the tank in another room/closet/crawlspace then you will have several advantages.
1) greater space.
2) possibly cooler temps(basement/crawlspace)
3) quieter....pumps in other room
Mine is under the tank but think if I had it to do again I would run it into the crawlspace.
Now I still have utilized the concept with my ATO.
Sump/refugium is good because it adds total water volume(harder to mess it up fast), increased biological filtration.