If we place four hooks spaced 7" apart, the overall length will 21", with 3.125" from the edge to hook 1, and 3.125" from hook 4 to edge of the board.
if we place four hooks spaced 8" apart, the overall length will be 24", with 1.625" from the edge to hook 1, and 1.625" from hook 4 to the edge of the board.