Since you’re getting the 2” hitch, I’d strongly recommend looking in to one of the tray-type racks, rather than a hanger style. It’s a lot easier to get the bikes on and off, and it accommodates different shaped and sized frames better.
Some of them have swing-away functions that let you get into the rear hatch without unloading the bikes first.
For security, if you can’t bring them inside, get an 8-foot cable and a large padlock, the kind you’d use to lock up lawnmowers and things, and lock everything through the safety chain loop on the hitch receiver. Park conspicuously, like by the front door. Like locking up a bike anywhere else, any setup can be defeated with enough effort; you just need to make it enough of a PITA that a potential thief will look for something easier to grab.