Is it possible to install a SSL Certificate on several servers?
Of course, SSL certificate installation on several servers but SSL certificate must be SAN SSL certificate which will allow multiple domains and server security on single server ssl certificate. SAN SSL certificate will be available from major Authorities only such as GeoTrust, and Symantec only on global scale.
Generally spoken no, a certificate can only be used on one server. However there are certificates which can be used on several servers, or you can buy more licenses to use it on more than one server, for example SSL SAN Certificates. If you want to secure multiple host names for the same domain and server, you can use a Wildcard SSL Certificate (example: webmail.yourdomain.com, intranet.yourdomain.com and www.yourdomain.com).