A:AnswerIt supports tilt in the vertical and horizontal axes, and can pan out as well, making access to connections on the back of the TV more easy. It supports moving the TV from side to side to get it centered over where you want, within the limits of its size. It does not support raising or lowering the TV in the vertical direction.
A:AnswerYes, it can mount a 50"Samsung. It does not pivot left to right. It has only 2 degrees of freedom, you can move the TV in/out of the wall and tilt the screen up or down.
A:AnswerIts not all plastic the frame and tilt mechanism is mostly coated metal. Tv is easily removed depending on how heavy it is obviously. My 65"requires me to have a helper just because of the sheer size. Something smaller could be easily removed by a single person. However the brackets for tilt/extending will come with it since they bolt to the back of the tv itself.
A:AnswerYou should be able to use this mount as both left and right arms are detachable and easily mounted on the wall bracket, just keep in mind due to the narrow width you will be using this for that if you decide to also install a wall outlet behind the TV to account for its location vs where the arms will be attached.