Omega D (4x5) is about the same dimensions. The Beseler 16x20 already overhangs by about 3 inches all the way around. I don't think my 20x24 Saunders would fit. At least with the Omega, the tall column is for cropping. I think 20x24 would require, wall mount and drop table.
You should mark the center of the lens as it projects to the baseboard (use the laser from below or make a big X on a negative and project it down). Measure that distance to the column. Many 4 blade easels place the image in the geometric center. So divide the front-back dimension of the easel by two to see if there will be enough room without the easel hitting the column.