Rev-A-ShelfCloset Ironging Board, Gray

Is there a trick to get this to lay flat? It seems to to bend upward when pulled out when it should be flat. Or maybe mine came damaged?

Can this be installed in a 15" base cabinet ? What is the smallest base cabinet in which it will fit ?

What is the minimum height and width of the drawer opening itself needed? and the depth of the cabinet

will this fit in a 21" wide base cabinet drawer? Or does it need a 24" cabinet drawer