1. Copy the meshes Dir to your data Directory.
2. Copy _one_ of the esps to your Data Directory.
3. (optional) For compatibility reasons and to make sure you don't loose your collars should you decide to change versions
              I recommend renaming your esp to "rxl_collars.esp" (The Installer does this automatically)

as = Armorsmith Extended Version
cw = Crafting Workbenches Version
_noll = Craft only Version

I personally recommend using One of the Armsmith Extended Versions.
If using both AS and CW I recommend the AS Version.