While I do have a two car garage - the driver for me appears to be the height restriction in opening the Falcon Wing Doors (FWD). They will typically open about 3/4 of the way, setting the edge of the door at just about forehead height (don't ask me how I know). After a couple of...painful reminders...I now tend to be more careful. Same for the rear hatch, have to bend down a bit when that is open.
We primarily bought the Model X because of the FWDs, and putting the grandkids into the seats. It is quite possible, and very convenient, to do it in the garage, even with having to bend over to get into the door space.
As for car placement, I use a $20 motion activated laser marker to set the drive-in distance. I set the marker to show the laser dot coming just onto the dash through the window, then I know I am in the right position in. I also use it for my second (now seldom used) as that need to be set within about 2 inches so as to not hit the motorcycle parked in front, and still be able to close the garage door. (It is a dual laser marker unit mounted to the garage ceiling - motion activated. can also be used to provide a marker(s) on the hood as you drive in for Left/right alignment.
With close parking (in Paring lots or garages), I typically have more issues with opening the driver door and not hitting something, than with opening the FWD.
You will really, really love having the FWDs for putting the kids in their car seats, I meant really really love it. The car and seats are just the right height with outstanding access.