Can I install an SSL SAN on multiple physical servers?

The specific ability depends on the company that provides the corresponding certificate. More specifically:

GeoTrust SAN certificates can be installed on multiple physical servers for free.

SAN certificates from Symantec and Thawte can be installed on multiple physical servers for an additional fee, as it is necessary to purchase the corresponding licenses.

In case you are interested in obtaining additional licenses, you request them through the panel of the respective issuing authority (Geotrust, Symantec, Thawte) and then we contact you to apply the relevant fee to complete the process.