I bought a couple of Raingler cargo nets, mainly as a safety precaution. On trips I tend to have containers full of heavy objects like recovery gear. The thought of all that heavy stuff flying into my wife and me in the event of a wreck was a little scary, so I finally did something about it.
The cargo net has six attachment points and makes use of four existing features (passenger seat fixtures and tie-downs on floor). You have to add two steel cleats near the junction of the c-pillar and the roof. That's a bit of a problem as Rainger gives no installation instruction for the KJ/KK. I sent an e-mail asking for instruction and they said "it can be installed anywhere in that area of the C pillar".
So here's where I put it:

That location should be sturdy enough, but it's well behind the plastic trim / fascia. So access is a problem. I had to cut away some of the trim. Problem with that is you can't get to the cleat without removing the rear seatbelts and pulling away the trim.

Here's what it looks like with everything installed:

I also bought a cargo net to hold down a large tote bin:

And here's what it looks like more realistically with some of my crap thrown in:

We'll see how it works out. Because of the difficulty of removing the top straps, at least how I installed it, it'll probably remain semi-permanent. That wasn't the plan, but I didn't see a better way. Maybe there's a better place on the roof, behind the headliner. I couldn't see what was going on there.
I had planned to add an All-J rack but that's on hold at the moment.
Again the motivation for doing this was safety in the event of a wreck, especially when the rear seats are down.