When I used to manage on line libraries, any library "sysop" was required to scan with at least two AVs before releasing any files for d/l.
One of the ones we oft used was F-Prot which was nice as you could choose to have it function as either an active scanner or just let it do nothing until you wanted it to (no active scanning). So while using another active scanner, I would have F-Prot just do nightly scans while everyone slept and over about 15 years it caught 2 or 3 issues that other vendors missed.
You can d/l it and use it free for 30 days... used to cost me about $2 per seat.
http

/www.f-prot.com/download/
As for Defender, having Defender defend your PC is kinda like the letting the Freedonian Army and Rufus T. Firefly guard your borders (that was for the other old fogeys)
https

/www.av-test.org/en/antivirus/home-windows/
As you can see above Defender scores far worse than any other free AV.