It just went right in the stock 2” receiver. Quite impressive how much it can hold. It also folds up, and still allows access to the top rear window to open. Just from Amazon, it since it won’t be something I plan to use often. ARKSEN Folding Cargo Carrier Luggage Basket 2" Receiver Hitch (60" x 24-3/4" inch) Camp Travel Fold Up SUV Camping, Black https://www.amazon.com/dp/B011VP2DR0/ref=cm_sw_r_cp_api_glt_fabc_GY0TZGSN20XVERWXDKKZ?_encoding=UTF8&psc=1
It will also come with a hitch if you want a tongue-mounted luggage carrier like the linked one. A bit tacky but frees up your trunk for stuff you use on the road easily accessible while the destination luggage is tied down. The good thing with the 3 is you won't need to install one aftermarket.
Again not choice #1 but it's available and really expands cargo area.