I want to use KDE Plasma instead of Mac OS ugly (in my opinion) interface
Then you want to run KDE on Linux. This is not going to replace your native mac desktop environment.
Honest question: why use MacOS at all then? If you prefer KDE, why not run a system that KDE natively supports? Is it a particular MacOS application? Or is it that Linux support on Mac hardware is not good enough?
This is possibly the first time in human history this opinion has been stated.