Giuseppe Cassibba

A public IP is always shown, but using TOR proxy this IP is not your one. You can check this by looking your IP without proxy and verifying it again after enabling TOR proxy. About DNS queries, with Firefox you can also enable option "Proxy DNS when using SOCKS v5"

Thank you Abhinav. In my opinion, the cool thing is that this can be done with a very cheap hardware (Raspberry PI Zero W has a very affordable cost) and with a very low power consuption (RPI Zero W users 5V and about 0,5A)