Help with Ordering a new system

Thanks in advance for all suggestions/corrections. I am a newbie and trying to understand what I should be ordering.
I have a 200A service into a “main panel” This panel has only 2 circuits in use. There is however a 2nd sub-panel that has 16 circuits. These two sub-panels are 10 feet apart. I would like to monitor the main as well as individual circuits.

What would I need to order:

  1. IoTaWatt 120V Kit +
  2. IoTaWatt Generic Kit +
  3. 18 50A Transformers

Any input is greatly appreciated. Thanks