I placed my VST in
C:\DAW_VST\32 (for 32 bits)
C:\DAW_VST\64 (for 64 bits)
And add these folders for vst scan.
I will also add sub folders within, such as
C:\DAW_VST\64\AAS
C:\DAW_VST\64\FXPansion
etc...
This is much clearer than default \Program Files and \Program Files (x86).
But the main reason I do this is due to the included Nomad plugs that only works on current version of Sonar.
I have the full purchased Nomad plugs that I used to placed in the default Vstplugins folder. Then during an update, Sonar replaced all these open plugs to closed ones. Putting it away prevent any of this from happening in the future.