I think the NUC D54250WKY is OK when used with one or two endpoints in a group. Once you go to three in a group then it starts having problems.
See my other thread at
Since changing the Core to a high spec 2019 i5 iMac I’ve been able to run 4 endpoints in a group. There have been a few dropouts but the Roon logs imply they are due to glitches with our external broadband connection.