I haven't really seen anything on here about roof rack options aside from one very small image where someone had one on theirs so I figured I'd give my experience with one so far. The only manufacturer I found who makes a rack for the ZDX was Inno. In the past I've had a Thule rack and a Rhino Rack for other vehicles, but when I questioned them neither had any options, and Rhino Rack said that due to the sloping rear roof it is "too dangerous" to use a roof rack.

I ordered the Inno rack online, it's just their standard, cheapest rack, and it has worked fairly well the couple times I've used it. It's not the most attractive with its square bars and high clearance. They have a more aerodynamic option that supposedly will also fit, but a customer service rep from Inno said there would only be about an inch of space between the bars and roof so it wouldn't be the best option.

 

It doesn't look to bad at all.
Have you had a chance to mount anything else on it other than your kayak? Like an aero dynamic luggage carrier, for instance?