First of all, I definitely recommend installing these yourself (or get a friend to do it). It's fast and easy, and saves the labor. Also order them online - cheaper than through a dealer.
Anyway... I completely failed to take a picture of the location where you drill... The instructions say to look for a small untextured area. That "small" is an understatement... it's a small circle just below and behind (respective to the car) the mounting spot for the cargo cover. The spot you're looking for is a dimple a bit less than 1mm in diameter.
Next up, drill a 1/4" hole on that spot. This one is the passenger side. Here you can tell where your dimple should be. (Ignore that scratch on the plastic to the right... made that happen within the first week of owning the XV. Awesome, right?)
The 1/4" hole is mainly to get your hole started and lessen the chances of slipping away from the dimple [and ruining the interior of your brand new xv!] because now we're going to make the hole bigger with a 1/2" drill bit. (This picture is the driver's side. Again, hole is below and behind that square spot.) Now you're through the worst of it.
Now place the plastic ring on the 'mushroom mount', put it in the 1/2" hole (it's a tight fit! I had to finagle it a little bit...) and then screw it clockwise to cause the thing to expand to hold it in place. The OCD-type that I am, it had to have the notch centered up top...
Nothing left to do but put the nets on.
Seatback net with seats up. (I've found I prefer to leave my seats down though... so this one won't likely be mounted often).
Note: the rear seatback and side cargo nets use the same mushroom mount, so if you order both sets you'll receive four mushroom mounts. You only need to install two of them.
Anyway... I completely failed to take a picture of the location where you drill... The instructions say to look for a small untextured area. That "small" is an understatement... it's a small circle just below and behind (respective to the car) the mounting spot for the cargo cover. The spot you're looking for is a dimple a bit less than 1mm in diameter.
Next up, drill a 1/4" hole on that spot. This one is the passenger side. Here you can tell where your dimple should be. (Ignore that scratch on the plastic to the right... made that happen within the first week of owning the XV. Awesome, right?)

The 1/4" hole is mainly to get your hole started and lessen the chances of slipping away from the dimple [and ruining the interior of your brand new xv!] because now we're going to make the hole bigger with a 1/2" drill bit. (This picture is the driver's side. Again, hole is below and behind that square spot.) Now you're through the worst of it.

Now place the plastic ring on the 'mushroom mount', put it in the 1/2" hole (it's a tight fit! I had to finagle it a little bit...) and then screw it clockwise to cause the thing to expand to hold it in place. The OCD-type that I am, it had to have the notch centered up top...

Nothing left to do but put the nets on.

Seatback net with seats up. (I've found I prefer to leave my seats down though... so this one won't likely be mounted often).

Note: the rear seatback and side cargo nets use the same mushroom mount, so if you order both sets you'll receive four mushroom mounts. You only need to install two of them.