Yes. The Dashboard can be run on any number of sites or meters.
To run this for your whole company, you can either select the Company level on the tree – this will run for all your sites, or you can select a Reporting Set or Custom Set to run all your sites or meters.
Please note that the Dashboard may take time to load when being run on larger data sets. Running 100 meters might take 5 minutes, whilst 1000s could take up to an hour.