We have the Rohl tuscan brass faucet. There is 9.5 in. between the far right knob and the end of the farmhouse sink. The two knobs and center of the faucet are 4 inches apart. Should the spray be installed 4 inches from the far right knob for symmetry or should the spray be in the middle of the empty space between the far right knob and the right edge of the sink, which would be 4.75 away from far right knob? Its calcutta gold marble that we are cutting and I really want to get it right! I know there is no right answer, but what do the designers think?