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You will need to install LANSA on one or more platforms to create the desired configuration.
You will typically use separate machines for your Web Server and your Data/Application Server:
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Mixed Multi-Tier deployment model
You will typically use a Windows Data/Application Server and a Windows, IBM i or Linux Web Server. 
Refer to Mixed Multi-Tier Deployment Model for more information.
Mixed Multi-Tier Development and Deployment Model
You will typically develop your application on a Windows platform as shown in the following example but you will import the Web application from the Windows machine into the Data/Application Server.
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Single tier model
A single-tier deployment model consists of a single Windows, IBM i or Linux acting as both the Web Server and Data/Application Server.