'Surface wind' is measured at 30 feet. Don't think it's going to make a lot of difference to the 50 feet wind, which should be your threshold crossing height. I'd be more concerned about the 1000-2000 feet wind, which could well be a 30 kts tailwind. This might make it hard to establish a stabilized approach by whatever your company's requirements are.
Yes - that is true. My wording wasn't very good. I meant precisely what you have described above.