Question on folder structure for multiple Mame versions

[Bunghoolio]

I want to have multiple versions of Mame on this one dedicated PC - a few older versions of Mame (have some Roms for each already) to get my feet wet and then the latest version eventually.

Just trying to lay out the folder structure before I install everything and am wondering if this will create any problems, or if there is a better way:
 C:\emulators\programs\mame72
 C:\emulators\programs\mame106

Do I absolutely need a specific mame folder C:\emulators\programs\mame
I plan on using Groovymame, CRT_EmuDriver, and Mala.