SDRplay has released a new downloadable Raspberry Pi SD card image which adds support for the RSPdx and simultaneous use of both the tuners in the RSPduo.
This V0.7 release is the first build to support the RSPdx and RSPduo in master/slave mode. The image also supports the RSP1, RSP1A,RSP2 and RSP2pro.
The list of software on this image is: SoapySDR/SoapySDRPlay, SoapyRemote, Cubic SDR, ADSB (Dump1090), and the updated RSP TCP Server
The V0.6 download, with some additional third party software, is still available for the RSP1, RSP1A,RSP2, RSP2pro and RSPduo in single tuner mode.
Full details and links can be found here: https://www.sdrplay.com/raspberry-pi-images/