TIM Plus 200 would be best. A single TIM Plus 200 license will allow you to log up to 200 extensions across up to 5 sites.
You will be able to allocate different log-in's for the managers of each site and can also allocate separate login's for the individual team managers on each site. There is no limit to the number of concurrent users accessing the system.
As well as having the ability to schedule e-mail reports to anyone, you can also set up display boards at any point to show up-to-the-second stats. e.g. head office may want a display board showing response times to calls at all 4 sites or the sales manager my want a display board showing call stats for all sales teams. Note that these display boards can be viewed from any site using a standard web browser (password protected).
You could use 4 x TIM Professional licenses but the centralised TIM Plus is more cost-effective, feature-rich and would be our recommended option.!!!!!!!