kitchens - Which side of a shelf liner faces up? - Home Improvement Stack Exchange

I have a shelf liner that has bumps on one side and is smooth on the other side. It is non-adhesive. Which side faces up, or what are pros/cons of each? It looks like this

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Steel Shelf Bracket Modern Kitchen Open Shelving, Iron Shelf Bracket, Industrial Kitchen Brackets, Metal Shelf Brackets, Custom

kitchens - Which side of a shelf liner faces up? - Home Improvement Stack Exchange

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