Please note that for MAG or MAC Address based boxes, each subscription is per device (by selecting MAG/Smart STB). There are no multi connections available for them. All subscriptions are per line (MAC Address). For this reason MAG/MAC Address based boxes can have multi lines but no multi connection.
Multi connections are available only with m3u lines (by selecting firesticks/android/apple/smart iptv). 1 line can have multiple connections using same username/pass. So for example, if you bought 5 connection package then you use same username/password on all 5 devices.