Just give it a try :) i started a VM and done with AD and CA in the same test server (not recommended) just to see how it look like and the changes.
OS - Windows Server 2019 (Nov 2020 update) and trying to install the SfB2019 of course the prerequisites functional support is windows server 2016.
On my VM mount the SfB2019 ISO and run it.
Then push with Add-features couple of things are failing and need to go ahead with manual check and understand that .net framework 3.5 needed for topology to start with but it is failing part of the process.
and i try to install the the topology on windows 10 latest update i manage to do that just to open the topology and take a look.