I've been using one of these for the past two years and they work great and they're cheap. Flip it upside down and bend the arms a bit to secure it to the heater. I toss some tinfoil on top to keep things tidy and it gets warm enough to cook hot dogs, heat up pizza, pre-cooked wings, etc.
https://www.homedepot.ca/en/home/p.1...000120449.html
I can take pics if someone is interested.