A:AnswerI don’t think this mount will work on that steep of an angle.You could build something out of wood or steel to have a platform for the mount to be attached at 90 degrees
A:AnswerThis mount is designed to fit TVs from 42" to 90", so it should fit your TV. I'm not sure what 400x300 means, but you secure brackets to the TV using hardware provided and then securely hang it in a wall plate you have secured to the wall. I would think that major TV makers and mount makers have coordinated so they work together.
A:AnswerThis mount had many screw sizes with it and I would assume that one of the sizes will fit your 60" TV. I would think that major TV makers and mount makers would coordinate together to make sure they work together.
