What is the best way to use SSL with mapped domains?

I tried following the conversation here:

https://premium.wpmudev.org/forums/topic/multi-site-domain-mapping-and-ssl

but much of it was above my head. THe simple question I have is:

If I have a sub-domain install with domain mapping, would it be possible to buy separate SSL certs for each mapped domain and use them for the site?

Thanks!