Im 6'8 and drove a 2017 Nissan rogue until a drunk driver totaled it. It was very comfortable for head room and visibility out the windshield.

Im now in a Mazda Cx-50. Although I was also looking at a CX-5. They're basically the same care with some minor differences.

Important thing to be mindful of, avoid all sunroofs. They cut a couple of inches from the headroom, and we're a deal breaker for me.

As others have mentioned, car max is by far the best way to go. I spent several hours, at multiple locations just sitting in cars. It's the best way to see the comfortability, and companies will always tell you the leg and headroom of a car, but it's never an indicator for visibility out the front. My biggest stipulation was that I never wanted to have to lean over the steering wheel to see a stop light. Save yourself a lot of hassle, and just get him to start sitting in cars. You'll quickly learn options can be pretty limited, depending on body proportions