A: Each basket is 3 and 1/4 inches, and the overall height of the unit is 16.75 inches. You should be able to store cleaning supplies depending upon the size of the bottles.
A: Yes, this will hold cleaning supplies, most bottles will fit on the bottom shelf.
A: The cabinet needs to have an opening that is at least 15" wide. In most cases ths would be an 18" frameless cabinet or 18" face frame cabinet with a 1-1/2" face frame.
A: These will hold pots and pans.
A: Both shelves are rated at 25lbs each.