Mac Internet Security X9 provides good antivirus protection against the latest threats, and has been generally rated highly by the independent testing labs in the past (although it slipped slightly in the most recent December 2020 Mac test by AV-Test).
Intego is a veteran antivirus provider which has been defending Macs for over two decades now, so if there’s any software maker that knows what kind of security Apple machines need, it’s this company.