This is what my wife wants me to do, I wouldn’t even need to cut a hole in the back, because there’s no backing to the bookshelves (building them right up against the wall). Unfortunately it’s the outside frame of the end unit that runs right over the middle of the outlet. I tried for hours to slide all the bookcases over a couple inches in either direction to avoid the outlet, but doing so screws up how the corner unit is angled and makes the whole thing look goofy to me.. seeing it every day like that would drive me insane lol. Thank you for the suggestion though!