How many SSL certificates needed for load balanced web servers

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I have 3 servers. 1 is IIS-ARR load balancer. 2 servers are IIS web servers with my website hosted. I want to run the website on https. So how many SSL certificates are needed, which servers I have to create SSL CSR request and Which servers I have to install them.

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user13727833 On BEST ANSWER

I found a solution for this from another query. I need to use a certificate with Subject Alternate Names which is authorized for multiple domains. Such a certificate could, once installed where the CSR was created in order to pair it with the private key, be exported as a bundle including the private key then imported on all involved servers. So, just 1 certificate will solve the purpose.