No, they need one IP each. This is because when the server gets a connection on an ip with 2 sites, it doesn't know what certificate to use until it sees the host-header, and by then its too late
So the only way for the server to know early enough is by the ip that the connection comes in on. Therefore you need as many unique ips and you need certs.
You COULD instead run the different certs on different port numbers (but the same ip) instead of the standard port. But this wont be as pretty.
We do co-location and system management in Stockholm, Sweden. Unfortunately we cannot host you, but i'm sure you'll be ok.
Remember, the best backup in the world is the one you make yourself.