I'm not sure what your question is about, but as usual, the context is everything.
In my list of examples there is one in plural: "Preséntense los siguientes documentos".
Without any context, you may think that someone told a group of people to show those documents to one another, because the pronominal form would be likely in this case. However, if the same group of people is going to do some paperwork, they will know where to show the said documents.
Not knowing any context, the order "Escúchense", may be asking a group of people to listen to each other.
A different thing will be if you tell these same people: "Escúchense las siguientes instrucciones." In that case, they will all be attentive to the instructions that will be given to all of them, since it would be unlikely to tell them to give these instructions to one another, except in very specific cases.
