Can I deploy the Web Server and Lightstreamer Server on the same machine?
You could, but usually it is better to dedicate at least one machine to Lightstreamer Server, if you are expecting high loads or many concurrent users. In any case, you will want to make sure that both the servers listen on standard HTTP ports (80 or 443). So, in order to avoid port conflicts, if you install the two servers on the same machine, some virtualization software should be used, in order to enable binding to the same ports.