The official answer is that the Macbooks are not supported by ROCK. You may be able to install it - or you may not. In any event it would be considered Tinkering
I’m not sure that there would be much point installing ROCK on the 2019 Macbook - even it it’s possible. I don’t think you would gain anything. Roon Server should run just fine on this machine.
With respect to the 2011 Macbook, if you are running Roon 1.8 because the OS is too old to run Roon 2.0, you may be interested in the thread talking about a ROCK install on a 2011 Mac Mini at :