Where is MQ_INSTALLATION_PATH?

Sometimes I do wonder where will be the installation path is? There is a shortcut for this, issue a command dspmqver, it shows me the detail information about WebSphere MQ. From there I can see InstPath showing where this tool is installed:

Name:        WebSphere MQ
Version:     8.0.0.2
Level:       p800-002-150303.DE
BuildType:   IKAP - (Production)
Platform:    WebSphere MQ for Linux (x86-64 platform)
Mode:        64-bit
O/S:         Linux 3.13.0-62-generic
InstName:    Installation1
InstDesc:    
Primary:     No
InstPath:    /opt/mqm
DataPath:    /var/mqm
MaxCmdLevel: 801
LicenseType: Developer

Or maybe I have overlooked, the documentation did mention where does the MQ_INSTALLATION_PATH is. Below is the text extract from the guide:

The location where WebSphere MQ is installed is known as the MQ_INSTALLATION_PATH. The default location for the WebSphere MQ product code is shown in the following table:

Platform	Installation Location
Linux, HP-UX, and Solaris	/opt/mqm
AIX®	/usr/mqm
Windows 32-bit	C:\Program Files\IBM\WebSphere MQ
Windows 64-bit	C:\Program Files (x86)\IBM\WebSphere MQ

On UNIX and Linux systems, working data is stored in /var/mqm, but you cannot change this location.