(re photos in linked article above)

Most of the bikes have the aeros low, pads just above the drop bar, for, well, aero.

A couple have the aeros raised a good deal for comfort, usually via risers that fit between the handlebar and the top clamp half of the aero, but that also requires an aero where the bars come from the top clamp half. Not all do.

A couple have the aeros spaced WAY up, further than I thought risers were available, but I see on one that it uses a separate stem on (a tall) steer tube, mounted above the stem holding the handlebar, and that top stem then has a stub middle bar (in place of a handlebar) that the aero clamps too. Good to know, but not possible on my bike with the handlebar clamp welded integral with the long vertical handlepost, so I'll need to use double-clamps to perform the same function, putting a stub bar about 70mm above the handlebar for the aero bar to clamp to.