How to execute it on WAN for testing purposes only

[X3eRo0]

I have my PC running on internet via a router and the attacker machine is on mobile hotspot and port forwarded with ngrok. When creating meterpreter.bin I used LHOST 0.tcp.ngrok.io and LPORT be the port given by ngrok (this is how I do it on normal Meterpreter sessions) now when I scan the public IP of my victims PC with nmap it shows Linux os and shows that it's a router in msfconsole I set LHOST to be 0.0.0.0 and LPORT to be the port forwarded by ngrok.
Now tell me that if I use public IP that shows Linux by nmap can help me get success in this exploit on a windows 8.1 vulnerable machine?
I will upload the nmap report once I get back to pc