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Create a e-mail alias which distributes to all of the internal stakeholders. Like email@example.com. That way only 1 contact is added to the database.
Pretty much what Chris said, your IT team will probably have an 'All@' distribution list, or they can set one up with the specific internal people you would like to send to. We did the exact same thing - different distribution lists for different sales teams. And then made sure they only got added to the email sends that were relevant to them.
In answer to the other question - there isn't a limit to how many people you can send an alert to but you'd still have to put all the individual email addresses into the flow step.