I say, and with God's success: It is sufficient that the predominant assumption is that he is poor in order to give him support. Although orphanages pay directly to orphans, and no expenses go to the center, it is permissible to give them zakat. As for mosques, it is not permissible to give zakat to them because they are not a recipient, and the condition for giving zakat is the ownership of a Muslim, which is not fulfilled in the mosque. And God knows best.