I am just here to say that your requirements are not well defined or thorough enough for anyone to give an accurate answer, a rough swag yes.
Just my opinion!
Will any logging be required?
Will any reporting be required?
Will there be any fail over or power failure work arounds (transfer of traffic from other sites to your site for example)?
I dont have a clue what ASN means but do you mean firewall or spam or other services will be covered by different devices?
What are the security/cybersecurity requirements?
What are the admin control and access requirements?
What are the expected uses of the servers (email, browsing, gaming, streaming?? goes to load besides number of users and complexity of traffic)
What are the services and throughputs expected from the ISP
How many ISPs will serve the centre? (How many physical lines for each).
and this is from someone who has no IT clues or experience. I bet a real IT procurement experienced individual could come up with much more populated list or better targeted questions.
Finally, my mother told me never to trust a man driving in a red car sporting a beard.