Three words for you .... quality not quantity.
Well, you were the one who raised the concept of multiple engines. I merely emphasized the fact that it isn't limited to paid-for AV's.
The main site I have examined (av-comparatives) tests paid-for versions.
I don't know about other testing sites, so I defer to your knowledge on that one.
I've never had to wave a chicken over the computer to prevent malware. (Nor do I have good luck charms hanging from the rear view mirror in the car.)