Multisite ecommerce setups and using SSL certificates

Question about Drupal multi-site ecommerce setups and using SSL certificates. I know that to use an SSL certificate, a dedicated IP address is required. So if you have a multi-site setup where each site needs to have an SSL cert, each site in the multi-site needs it's own IP address. From what I've read, this is quite a challenge to get around. So, I was wondering....what if an SSL certificate that secured multiple top level domains and used only 1 IP address was purchase - like this -
http://www.instantssl.com/ssl-certificate-products/ssl/ssl-certificate-m....
Would that work?

Thanks,
Mickey