The networked endpoints currently supported by Roon are AirPlay and Meridian devices.
We are working on supporting more, and on developing a protocol that can be integrated by hardware manufacturers for high-res streaming. PS Audio is one of the companies we are working with.
You can use the NAD D 7050 over AirPlay. AirPlay natively runs at CD quality (16/44.1), so higher-resolution content will be resampled in Roon (not the best for quality) before sending data over the network. If you mostly have CD-quality content or lossy (MP3/AAC) files, then this is a non-issue.