So in thise case you need more than one IP-Adresses to set up different ssl sites.
Another alternative would be the use only one ssl site and use this as proxy for others.
E.g. you have https://sslproxy.yourdomain.com
and set up a proxy that proxies sth. like https://sslproxy.yourdomain.com/sslcuostmer1
to whatsoever internally.