I don't think we're supposed to screw into the fridge. So I think that brace is just meant to hold it in place. A residential fridge sits on the floor/deck, unlike a gas absorption fridge which is built in.
What fridge do you have? I can ask what is supposed to be there.
PLEASE do not send questions via Private Message, my inbox fills up too quickly. Post questions in the forum as a new thread so that other users can benefit from the answers. Use Private Messages for sensitive information only (VIN, Contact info or things you do not want the public to see).