The Sonore UPNP bridge is the simplest way to do this but if you are a bit savy you can do this for free using the lms-to-upnp software. See this thread for more information https://community.naimaudio.com/t/howto-roonify-non-roon-streamers-lms-to-upnp/751
I’ve been using this method for 4 months now and it has been faultless with my NDS. No going back to the Naim application.
I was initially using my QNAP as the Roon Core but have just moved over to using ROCK on an NUC with an improvement in performance and possibly sound quality but I may be kidding myself on the latter! My setup certainly gives the same sound quality as UPNP voa Asset and the Naim application.