And just to clarify, currently the "Products" subdirectory is part of our internal architecture and you can't change it. You can change the root where those products will be installed (c:\radtools\tmssoftware), but after that the structure is given by smartsetup.
I blogged about the smartsetup internal structure here: TMS Software | Blog
Some folders might have changed since that blog post to now, but the idea is the one in that blog. Also note that you can have products installed in a different folder than "Products", but not automatically. SmartSetup is open to be used in your own projects too, so the "Products" folder is the one holding the tms components.