DC chin spoiler- asking before I drill!! :)

A forum member recently sold his DC chin spoiler to me for a fair price. He said that he had mounted it to the "inner and outer bumper brackets" (which I assume he means outboard and inboard legs of the "Y" shaped supports)...

Is this where Direct Connection suggested that this should piece be mounted? It looks like there are some options in terms of how far fore or aft the holes are drilled...any suggestions on that?

Thanks for any tips at all!!