I don't have a sonata, but assuming this is a sedan type car then any trunk mount rack will work.
The one I bought was from Canadian Tire (regular hardware store) and is of excellent quality, holds three bikes and cost $85. Whatever you do, never chose the cheapest unit because the goal is price point and you end up with land-fill junk, and then have to buy another one. My neighbour does this continuously, they end up paying twice.
Takes only 5 minutes to strap a bike and rack to the car, with no scratches to worry about, great investment.