I'm not saying that, I'm only getting two rats. There are no other cages in the market that are similar to a CN that are free standing and not in a stand. Both of the last cages linked say they fit 2 and 4 rats, and that's not including the shelving space that makes more usable space. I highly doubt all rat keepers have CNs or are bad rat keepers.
I've considered a rabbit cage, but I'm worried about them squeezing through the bars as I would like babies. And I can't risk that for the well being of the rats as I have two cats.