Don't buy it.  We have carpet and unit is wobbly.   I don't trust it even w cheap looking zip tie that mounts to wall.   If only it had better base for support.    Also you may not realize it stacks and is not bolted to unit below it.  Top unit just rests on bottom held from sliding by 2 pegs.   Since stuck with it using as single row bin which at least lets my kid use top as play table.   Wayfair should not offer this product.