I have a ghetto mod for all the greasy fellas.
I was at a junkyard a few months back and I found some mini cargo nets out of a Land Rover Discovery Series II. They actually fit PERFECTLY beneath the steering wheel of a 3G 4Runner (great place to put your phone) and work wherever else you want to fit them. Unfortunately you have to drive screws into wherever they go, so this is not for people who care about their interior.
When removing them from the donor vehicle they are very fragile. Use a small screwdriver to pry at the frame and use your hands to remove them. The mounting tabs will break off but you don't need them anyway. You might snap one in half (check first image to see where driving a screw in the center made a crack) but luckily a Discovery has 4 of them in the rear seating area. The piece of rope at the top of the netting will probably be loose but you can easily tighten and trim it. Alternatively you can use a piece of elastic cord.
Cheers