Really? I've never worked in an open plan in which the CEO didn't also have a desk. Never there and always in meetings, but no special office
I worked in one startup where the CEO worked in the open office "just like us" but he usually worked in a conference room (the nicest one!), not only for meetings. If he wanted the space, he got it.
Always. The C suite is too good for open space but it's fine for the rest of us plebs.