I've been researching this same question as well. We just purchased the 264BHW and haven't taken delivery yet but the TV install will happen soon after we get it.
From what I've read, don't trust the plywood backer to be 100% in the center of the sticker on the wall. They vary. I can't remember off the top of my head but in another thread in this forum someone found that it was 13"x14" and about a 1/2" thick.
Like iraqvet05 mentioned, using shorter screws than the ones that come with the mount are a must as well as finding one that can be removed while in transit.
This is the mount that was suggested in a previous thread that I think I'll end up ordering : https://www.amazon.com/gp/aw/d/B00LZ...I1U6MADFFRU70N
Please reply back when you're done so we know how it went and what you used!!