This was the problem. Mount didn't line up with mortar.

This was my solution. Mounting the mount on a board after I drilled holes that aligned with the mortar.

End product

65 inch on articulating mount.
65 inch on articulating mount.

65 inch goes through wall into this system.

50 inch.
50 inch.

Four 55 inch TVs mounted individually, together.

That's me trying to get them to align properly.

50 inch with hidden cables.