Thanks to all for the reply.
- Is an Audi A5.
- Trek Domane SLR and specializes sirrus carbon frame.
- Inside the car would only fit one and not the Domane without taking off the handlebars
- Installing a hitch would be tough based on how the car is designed. The add on hitches you see are installed poorly and end up damaging some part (also, they get almost always rusted in the midwest).
- Roof rack is maybe a more feasible option. I think the trunk rack is more convenient, so that's why I asked.