If you can position a freestanding goal away from your house and car, you should be fine. We have a freestanding goal (actually, it's our third). The only workable place for it on our property is the corner where our two garages meet. We have had damage to the house (gutters mashed flat, outdoor lights broken), damage to the car (basketball-sized dent in the rear) and wear and tear on the garage door. Also, the goal itself gets damaged when the base, which is filled with water, gets side-swiped by the car -- it leaks and then we have to put heavy stones on it to keep it from falling over. Another thing is kids like to hang from the goal and that can damage it by loosening the rim. I have considered replacing it with one attached over the garage, but I think the damage to house and car would probably be the same. And I don't want kids on my roof dislodging basketballs. So I am sticking with the freestanding goal.
Another alternative, if you have a good place for it, is to have an in-ground goal installed on your property. This is quite a bit more expensive but I would have preferred this in the long run if we had a good place for it, rather than keep replacing the freestanding goals.