A:AnswerNO!
My big problem with this mount is that it must be centered on 16" studs. I have a stud on the center of the room, so the mount is 7"-8" off center. The mount will not let me center a 77" TV, it tilts too much. Only buy if you have 16" studs that are near center of the location where you want the TV.
A:Answeras you can see on the picture, have several set of holes in the back to adapt the mounting plate, but 20 is excesive size, it could fit 17 max. Recommend instal couple pieces of wood in between that size to give you good support.