You can get support for Roon of course, but you can’t expect official statements about compatibility for devices that are neither Roon Ready nor Roon Tested. As Nucleus(+) and ROCK are both Linux based, you have to ask the device manufacturer, Marantz in your case, about Linux compatibility if you want/need some official statement.
As for general “Does it work?” questions: Sound United Brings Roon Tested Compatibility to 68 Denon and Marantz Products – and for most of them just because they support AirPlay.