It is not worthy to recite the phalashruthi of a stotram alone as phalashruthi mentions the benefits of reciting a complete stotram. Reciting that alone will not yield the benefit of reciting the stotram in its entirety. Hence one must recite the whole stotram. If it is not possible, it has to be recited along with the dhyana slokam though it is not considered equal to reciting the whole stotram.
There are two methods of reciting stotram; one on our own and the other as a group recitation. While we recite on our own, we recite the entire stotram individually. In a group, it is a custom that one group would recite the first half and the other group recites the second half so that the stotram is complete. It is enough that we listen while others are reciting.
While we are reciting on our own, we must recite the whole stotram aloud. If we recite for a particular fruit, then reciting in a group is not taken into account. We should recite aloud the entire stotram. Otherwise, if we want to experience Bhagavan or if we feel reciting stotrams is for the pleasure of Emperuman it is enough that we just listen to group recitation.