Thanks to you both. I’ll go take some close measurements at lunch I can always trim the rubberwood top on the 46" slightly at the edges if needed.
Is the distance between anything else “down there” less than 46 1/4? Looks like the front/back wheel bars (technical term I know) might project inwards another 1/4"? Hard to tell with the white legs in the photo.
The 46" version you choose if you want that crossbar in the middle or back, I chose back, can do the same on the 52" although I’ll need to figure something out since it still wouldn’t nest perfectly against the back of the wall with the 52" having a crossbar.