There are only 2 trunk mounted bike racks that are confirmed fits on your 2019 Audi A6 since there is not an aftermarket hitch option that would allow you to carry a hitch mounted bike rack. The best option would be the Malone Hanger Trunk Bike Rack for 3 Bikes - Adjustable Arms # MPG2139, which has adjustable arms to allow you to carry the bikes level and can hold up to 3 bikes. I really like that this comes with an integrated cable lock to keep the bikes secured to the rack.
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