I would strongly suggest that you get a reciever type hitch installed on your Murano. I am very leary of putting the strap on type bike racks on the rear hatch, I think there is too much probablility of scratches, denting, etc. The roof mounted racks are a chore because you have to lift the bikes up there. there is also a danger element, if you forget about them and drive into your garage or other low overhang.
I just had a reciever hitch put on, and it looks really nice. You do not have to get it wired if you are just going to slip in a bike rack. There are really nice reciever type bike racks made by "Hollywood" or Yakima"
One tip on price though. I called my local dealership and they quoted me about $480.00 to install the hitch, claiming 250.00 for the hitch, and $230 for labor.
I then called another mechanic place, and they said around $500.00 because they would have to remove the rear bumper to make the install.
I then called U-Haul, as they do hitches. They told me $150.00 for the hitch and $30 labor for total of $180.00, and had the hitch in stock. I dropped the car off and picked it up a hour later. Very professional job plus it includes life time warranty parts and labor. Warranty also covers any damage to the hitch due to accident, if someone rear ends you or something. I was very pleased. And NO THEY DID NOT HAVE TO TAKE OFF THE REAR BUMPER FOR INSTALL. So watch out for shady mechanics trying to grub your money.
We just got back for a 2500 mile trip with our bikes on the rack. no problems.
Another nice thing about the reciever hitch, is you now have the option of using it for other accessories like a luggage tray, trailer, etc.
Sorry about the long winded response.