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.
A:AnswerI used a 3/16 drill bit for the 2-1/2” tapcon screws
I put a picture of all the mounting hardware I had left over after installing. They give you multiple screws to use depending on the tv. Unfortunately, I couldn’t get a picture of everything since it’s already hung on the wall. They also give a little level bubble to help keep level.
