Perfect Path Technologies confusion

I’ve 8 STOP IT plugs and 3 Alpha E cards.  An exhaustive search of the forum and PPT website has not revealed to me clear concise usage parameters.  I own The Gate and that had only one closed ended application and it works well.

One STOP IT each in unused receptacle?  Or two in each if the plug is unused?  The cards, one atop each piece centered, over the power supply or under the unit?  Or stack them.  Thank you in advance.