I just installed 2-32" led's, I used a fixed quick release mount I bought from amazon for $13.00, I know your looking for articulated but this isnt a bad option and its cheap, in the bedroom I removed the door, cut the skin out and put 2 planed to thickness 2x6's, then put the skin back on (the original plan was to reskin the entire side but finding skins theses days is tough, the tv covers 90% of the part that was cut out though), I then caulked the seam and painted the door and hung the TV, have not put the power or cable jack in a better location but will be doing that today.
Most of the time our bedroom door will be open but when closed the tv will be dead center.
To run the power and cable to the ceiling I will remove the crown molding and cut a small hole then heat up my fish tape (just a little) and puch it to the hole in the ceiling, using a shallow cut in box the power and cable will now be located in the center of the ceiling.