Metal rack is mainly used in the process of mushroom grow. After you vaccination work in grow bottle or grow bag, you can put the bottle or bag on the metal racking.
According to your mushroom house, you will decide the tier quantity and height for each layer. The dimension for metal storage racks can be customized as your request. Of course, you can add four trundles bellow the rack. You can put it anywhere.
Maybe you will consider the cost. Don't worry about the cost. As you know, the material will affect the cost very much. As usual, there are metal and steel, different surface finished