As other have mentioned: some concerns with the ultra low price and "universal" nature of this rack.
However reading the instructions on the page it looks like it comes with a couple sets of hooks that are intended for rain gutter-less cars.
There are other similar racks in the same price range with straps that run through the entire vehicle rather than just clip to the door frame. I think Seattle Sports makes one.
Kayak & Canoe Outriggers
Heel and Pegpads™
Pull-Up Strap Handle Kit
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