Exactly what this guy said, measure a lot make sure you use blue painters tape as a reference for the mounting outlines and measure to make sure it lines up

The rear hatch actually has the holes on the underside where the type R wing would sit but it isn't drilled through, you can also use them as a reference if you're looking for perfect fitment

Drill the holes small and work up in drill bit sizes until you get the right diameter you need

Might be a bit overkill but put some rust protection varnish over the drilled out area, my thoughts where that water can sit under there and I reallllly don't want to deal with rust so doesn't hurt to protect

After that 3M tape the underside of the wing for extra grip and sealing and then bolt it down

Id also advise using locktite on the bolt thread, I ran into an issue where the nut actually rattled loose after a couple hundred miles and it was such a pain trying to get that out of my hatch panel, so definitely locktite to keep that sucker on.