When working on a project where you need to apply the same effect or effects to a set of similar clips, you want to do that quickly yet correctly. There are several slow and quick ways to have it done. Choosing the right way may depend on a specific set of clips. In the case of applying Neat Video, a lot depends on the noise content of those clips. If you have several clips shot in similar conditions, by the same video camera with the same settings, then the noise in those clips is most likely the same. So if you can quickly add Neat Video with exactly the same noise profile and filter settings to each of those clips, then you can save time on building a noise profile and adjusting the filter settings for each clip individually. Obviously, this will only work well if those clips show the same noise. Otherwise, you would still need to treat them individually for the best noise reduction results.
As any other video editing software Final Cut Pro has several different ways of applying effects to multiple clips at the same time. They include compound clips, adjustment layers, saved presets, and other methods. Find all the tips here.