With your paid SonarCloud service, is one able to run multiple scans at once, or only one scan at a time?
For a given project, multiple analyses can be triggered at the same time (let’s say 1 on your master branch and 2 on PRs for instance), their reports will be queued on SonarCloud side and will be processed one by one.
If you have several projects, analyses can be triggered independently and will be processed also independently, there’s no problem.