Antivirus needed for MacBook Pro?

absolutely NOT. all those types of apps are good for is causing big issues in macOS while providing zero protection or benefits.

if you would like to keep your Mac clean, you may want to read Effective defenses against malware and other threats - Apple Community. it's a long article, but worth your time to read every word.

Everything you need to operate your Mac and keep it virus-free shipped in the box. Apple is NOT holding out on you.

There is no other SENSIBLE thing you can add that will make it work better. But BOY is there a lot of junk.