StoveShelf is a US-based small business that specializes in stove shelves for various stove sizes.
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I purchased the StoveShelf in the white 20″ apartment size a while ago and am *obsessed* with how it utilizes and fills the space above my tiny stove. The magnets underneath are STRONG, but you can still move them easily. This is a good thing because if your stove is curved (or just has a dent in the top like mine…lol), you may need to adjust the positioning of the magnets so that the StoveShelf lies flat on the top and the items don't fall on it. It doesn't slip off. (I have found that placing the magnets near the front allows the StoveShelf to sit further back and maintain a flat, level position.) However, as a backup option, I have found that it works just as well when placed backwards so that the lip on the back faces the front – this prevents objects lying on it from slipping down!
Promising review: “This is amazing and I have no idea I didn't buy one of these years ago!!! My new oven didn't come close enough to the wall for me to put anything on it without it falling back. That was absolutely perfect. I'm very happy that the included magnets could be moved. This allowed me to place them perfectly for maximum support since my top was slightly curved.” –JStill
Get it on Amazon for $35.59 (available in three colors and three sizes).