I did something similar using the same libraries and all using a Raspberrypi and DVB-T dongle [1].

Then I configured the tcp server, rtl_tcp to forward the packets to my workstation. This allowed me to put the Pi in a location more suited to receive transmissions, i.e. not next to RF emitting servers and power supplies. Then, using Gqrx with remote server, I analysed the results.

[1] https://www.joechin.com/raspberry-pi-and-sdr-getting-started...