Is there a bus .. that takes it in the center of Laredo and leaves me there?

Well, none because the outlet is in the center. If you don't want to walk, there is a taxi stand near the line border

You arrive easily walking if you cross through the center. Once you cross you walk to the right it will be about 600 meters and you arrive

The subway but not close

You just take the subway but it won't leave you there