The original GNU Radio module by HB9FXQ is here https://gitlab.com/HB9FXQ/gr-sdrplay.
To compile and install this new version, you can roughly follow the instructions here https://www.sdrplay.com/docs/gr-sdrplay-workflow.pdf; the only change is that the 'git clone ...' command will be:
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git clone https://github.com/fventuri/gr-sdrplay.git
To be able to use this new version you have to have the sdrplay_api service up and running.
I tested and ran this GNU Radio module only under Linux (Fedora 29, to be exact); I am not sure if it will compile or run on Windows/Mac.
Also I was able only to test it with my RSP2; since I don't have an RSPduo, I don't know for sure if it can see both tuners (it should, since I tried to follow the same code in the sample app listed at the end of the 3.01 API specifications document); I would definitely be very interested if anyone can give it a try using an RSPduo and perhaps running the tuners in master/slave configuration.
Let me know if you have any problems building and running this GNU Radio module.