I have ordered two LG 5K displays and would like to prepare my workstation ahead of their arrival but the VESA mount details are sparse. These will be replacing 2 Thunderbolt displays mounted on the Bretford Mobile Pro arms that are attached directly to the wall. Unfortunately no matter how careful I was I wasn't able to get the TB displays perfectly aligned. Since I will start over with the new displays i'm hoping some kind sole might have some tips to get these aligned perfectly. I have a corner desk and the arms are attached to alternate walls and I believe my problem is that the walls aren't perfectly square. Using (probably improperly) a laser guide and levels didn't help me Also do the LG 5K displays come with a separate VESA attachment that can be pre-mounted or do you simply remove the current stand to expose the VESA mounting? Any pictures, diagrams, tips would be greatly appreciated.