Hi,
Install Roon on your MacBook Air and run it in remote mode pointing it at the Roon Server (Core) running on your QNAP.
Or use Roon’s tablet application for iPad or Android.
Have a read of [FAQ: How do I move my library over to RoonServer? How do I run headless?]
(https://kb.roonlabs.com/FAQ:_How_do_I_move_my_library_over_to_RoonServer%3F_How_do_I_run_headless%3F) for more details.