I tapped into the cigarette lighter port in the center console pretty simple. I'm pretty handy so I had a work around for the posts being a little sloppy mine are solid and do not wobble around at all.
Keep in mind as well these do not fit like 100% OEM but they are cheap and easy to install and do the job for me on my truck. If you wanted something more clean or more OEM looking I think you would need to spend a lot more money or get custom head rests made. I "might" be able to remove the DVD players from these head rests and mount them in the OEM head rest but I am not sure and not really sure I would bother.
What I did was slide a piece of shrink tube over the legs of the head rest to give it a more tight fit, they do not wobble shake rattle or move around at all. The worst part is removing the backs of the seats the clips are goofy and delicate I did break one removing it but you cannot tell. The center console is pretty simple to tap into the accessory power port. Inside the lower rear pocket from the back seats there are 4 torx screws simply remove those and pull straight up on the rear part of the console. Then I just cut the plug and soldered the wires to it from the two dvd players.
They are linked via RCA cable because each player comes with 2 inputs and 1 output, so I linked one players out to the others in and vice versa so that each player can share the others DVD OR each player can play their own independently.
I'd like to be as transparent as possible with these, they do sit back a little bit from the actual sitting side of the seats, I don't use head rests so its no big deal to me but as seen in the pictures they sit back about 1" from the seat face. Also one of the units came with a remote that is different from the other and it does not work properly. But the other remote works with both tv's so its fine for me. For the $ I can't see how you can go wrong with these.
I also lucked out I used to have an 08 suburban with RSE I kept the head sets from it, I was able to get both OEM GM head sets to RF link to these monitors giving me free head sets