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You will need to apply SSL's to 2 of the 3 IP addresses you currently have in order to qualify for additional IP addresses. IP addresses may be shared among many domains.
Please note, simply wanting a unique IP address to host domain names is not an ARIN approved justification for additional IP addresses. This is because virtually an unlimited number of domains can be hosted on 1 IP address with no practical disadvantages.
In order to issue additional IP addresses, please provide us with the justification that illustrates the necessity for these domains to have their own IP address, such as 'the domain uses an IP address'.
Examples
1) 208.x.x.x - Used for domain1.com -- [business justification]
2) 208.x.x.x - Used for domain2.com -- [business justification]
3) 208.x.x.x - Used for domain3.com -- [business justification]