Finally got to see the idylis, went to Lowes with 3 9 inch cutouts. Two cutouts fit with maybe an 1/8 inch of space between the two of them. A third could fit on the hump, but you would need one big collar to accommodate the disconnects.
Really only a two pin lock freezer and I would be wary of that without taking two kegs in to lowes to see if they fit. You would really need to lift them straight up and down, not a great deal of wiggle room.
ETA: Looks like it and the GE 5 cu are the same layout