Well, keep in mind that I have had this tank and this fish for less than two weeks and it's my first aquarium... BUT
I think the key thing is to ensure that the sponge sits under the spout enough to redirect the water flow through it.
I am currently setting up a 10 gallon tank and have the Aquaclear 20 filter going. I just had a look at it to see how I would sponge baffle it. It looks like I could do something quite similar to what I have here although the sponge sandwich would have to be thicker and shorter. I could still use the elastic bands to hold them together and there are places on the filter that I could hook the twist ties onto. It might take some playing around with it to get it right, but it's absolutely doable.
I went through a few different setups before I arrived at the one I currently have. I tried tying the sponges together with thread and weighting them with screws off the back, but that didn't work as well as what I have now (a lot more finicky to get them out of the way when I was cleaning and I would have to cut and replace the thread every time I wanted to change the sponges).
(edited because spelling counts!)