A:AnswerIt does support LFC, as it has FreeSync Premium Pro, and if you research that you'll find it is the highest tier of FreeSync support.
The range is 48Hz - 165Hz.
A:AnswerI connected my Mac Studio and it worked just fine. Considering the Mac Mini supports similar interface (HDMI) as an option, it shouldn’t be an issue. But i will not recommend this screen for any work related productivity tasks because its too big and eye travel from one corner to other corner of the screen can result in a lot of eye and neck strain.