For your 2017 Infiniti QX60 the Hopkins 4-way/7-way part # N40975 is a confirmed fit and would be exactly what you are looking for.
Then for a hitch the Curt # C13126 is a fit as well. view full answer...
The Curt hitch # C13126 that you referenced is currently the only option for your 2014 QX60. This is a Class III hitch with a 2-inch receiver opening.
For a trailer wiring harness you can use part # 118670 if you do not have the tow package or part # 118273 if you do have the tow package. view full answer...
We do have a Hidden Hitch part # DT86GR that fits your 2016 Infiniti QX60. When not in use the hitch opening removes and gives you a totally hidden hitch setup. view full answer...