At minimum you need two IPs, two FQDNs (one to each IP Address), and two certificates (to each FQDN/IP).
The only exception to this is using a Wildcard Certificate, which can be used twice (once for each FQDN).
At minimum you need two IPs, two FQDNs (one to each IP Address), and two certificates (to each FQDN/IP).
The only exception to this is using a Wildcard Certificate, which can be used twice (once for each FQDN).