Sure you can put more than one pair of Rams in a tank with that footprint, in fact, it often works better than having a single pair. The reason for this is that if a pair of Rams is defending a territory against intrusions by other Rams in the same tank, it strengthens the pair bond, and they will be less likely to get aggressive with each other. It also seems to increase the likelihood that they will successfully raise their fry, for the same reason. Years ago I had two pairs of Rams in a 10-gallon tank, and they would often breed synchronously, and raised many fry. I'm not saying this is the optimal arrangement, but it does illustrate my point.
I can't address the last part of your question, because I have no idea what 'copies' are. Good luck. :thumb: