I am trying to do a Challenge with my friend, (who gots faster to arena4 in Clash royale) and I need to stream from two phones in one video. I have computer and Asus Zenfone ZE551ML (mine) and Lenovo A536 (from that phone will be streamed friends' screen). Can you help me? I also have additional wi-fi receiver.
You could use a vnc server on each phone, and use a vnc viewer on your computer to connect to both the phones. You could then just record your computer screen.