To me it seems that you are making a mistake. It is true that the Barcelona GSE placed people in North America. However, it does not harm to look up who those people actually are.
People who are placed in top 20 US are predominantly (not all, but most of them) local students from Barcelona who completed their undergraduate studies at UPF already. These people tend to use the Master's program in order to take the time to apply for the PhD programs. (PhD applications in North America are - as you probably know - really time-intensive.) Because of the timing, they usually just show the grades from the undergrad and the grades in the Master do not play any role. So it is in practice the undergrad from UPF and the contacts they made there that get them in.
In practice, a high number of students from the Barcelona GSE continue with their PhDs at the local programs, e.g. UPF. If you have no previous connections to UPF and no other pedigree from a top institution elsewhere, maybe if you are among the top 5 students at the Barcelona GSE you have a shot at the top 10-20 in the US, otherwise probably not!
Think well about whether it is worth it. Students tend not to be happy with the organization/management of the Barcelona GSE master program.