Well, many plugins don't have an install, and are simply copied into a folder or sub-folder, and these can be moved anytime to anywhere, as long as you maintain their current location in the search paths for Sonar.
It seems to generally be stand-alone versions of synths/effects that get the actual Windows installation, with Registry entries and all of that, and then the accompanying 32-bit and 64-bit plugins routinely just end up copied into a common path, such as VST Plugins, or wherever.
From Sonar's perspective, as long as it finds it, through search-path inclusion, it will attempt to load it.
The other aspect is when there is associated CONTENT for a given plugin, such as a sample library for Kontakt 5, or Dimension Pro, or a preset library - and such. These generally EITHER are fixed, for some products, in which case you may have to reinstall to move, or might not be able to move at all, OR they may have an internal parameter that you can adjust to point the product to wherever its associated content lives. In that case, this is usually an install option, and if you change it later, you would change the path in the software and then typically do some sort of 'refresh' function to reconnect it to its associated content at the new location.
So, the bottom line is that you should be able to move many/most things around, but you will certainly have to look at the nature of what any particular plugin's processing requirements are designed, and then you would react accordingly.
When I install things, I usually install into the appropriate program files folder (x32/x64) per a given program's installation process defaults, and for dll placement, if given a choice, I specify either the Cakewalk plugins folder, or to one I created - VST Plugins (a sub-folder within the x32 and x64 program folders).
Plugins that are just downloaded dll's from places such as KVR, or wherever, usually get placed by me into one of the 2 VST Plugins folders.
You can also group the display of things in many ways - here are a couple of Sonar documentation links that talk about this:
http://www.cakewalk.com/Documentation?product=SONAR%20X3&language=3&help=Browser.07.html http://www.cakewalk.com/Documentation?product=SONAR%20X3&language=3&help=Mixing.36.html I hope that helps,
Bob Bone