Review on 🔌 Leviton 80301-SW 1-Gang Decora Plus Wallplate: Screwless Snap-On Mount (10 Pack, White) - Enhanced Aesthetics & Easy Installation by Steven Ross

They are for a single box. I've installed many of the hundreds of overlays and have to say these are the smallest I've seen. Pray your boxes are set up with ZERO space around them or they will have to be sealed or otherwise. I mean ZERO space! Also, the included screws are surprisingly short. I haven't measured them, but would be surprised if they were 1/4" long. Maybe 3/16"? Either way, unless your drawers are perfectly flush with the wall and secured perfectly, you'll be a little struggling and may not be able to snap the front in. On a new build this should be less of an issue but when rebuilding or just upgrading (which I do) I wouldn't recommend them.