I had a freedom ,but then bought a truck, so cant help with the first question, but on the second, yes you can. I did this when putting my wifes size small bike on, and my size large 29er.
Overall, I did not love the rack, which hurts because I am a big Saris fan. I got it because in the winter both our bikes had fenders and thus it would not work with the thelma. I felt like I was always fighting to get bikes in the right place. We had 7 bikes between the 2 of us, so if you are always putting the same bikes on this would not be an issue. But I always was adjusting the wheel holders based on what bikes we were using.

I have an older Saris Freedom. It’s the one made for mounting on a spare tire. My horizontal crossbar is about 3’ 10”. Yes, you can move the cups around as you need. As the other poster said, that is good and bad. It’s adjustable, but you have to consistently find the sweet spot that allows the specific two bikes that you are carrying that day to play nice. If you always carry the same bikes, its not an issue. If you are getting one that mounts to the spare tire, I used an additional strap to secure the carrier to the bumper to stop the swaying that can occur. Not sure if this helps or not. I can take pictures of the setup if needed.

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56-11...the only way to fly