I have a large number of plastic things inside my home that I hope do not become decomposed.
Garbage, sure, decompose away.
It does not multiply like you expect in a movie. So the amount it can decompose is limited by quantity of the enzyme.
Enzymes are proteins. They're applied to powderized plastic in a bio-reactor. It's unlikely that they'd be able significantly attack bulk plastics before they themselves get broken down.
Wait until some organism eats them and learns to reproduce.