While virtually any Hunter Douglas window treatment can be ordered to fit French doors, keep in mind that the product is typically mounted outside of the opening (beyond the window frame) and may require extension brackets or spacer blocks for proper clearance. French doors are distinguishable because both doors open as opposed to only one. Also note that in most cases a 'cut-out' for your French door window treatment will be required to clear the door handle or knob.
If Silhouette® Window Shadings are what you're interested in, their tilt-only low-profile hardware system is 60 percent smaller than the standard tilt-only system. The sleeker system fits perfectly with French doors, allowing you to open them more easily without a headrail hitting the wall. An optional tilt wand removes all operating cords for added safety in homes with children and pets.
As with all specialty shapes, you should consult with your local Hunter Douglas specialist when deciding which product will work best for your French door.