Your Digitech Whammy and EX-7 require AC power and cannot power from the DC outputs of your Pedal Power Digital (or Pedal Power 2 Plus). However, you can use the courtesy outlet to power your Whammy and EX-7 with their adapters. Note: Pedal Power AC can power your Whammy and EX-7.
So, you may still need some type of power strip/extension cord.
To power your Maxon RTD800 use a Pedal Power Digital 9VDC output with a standard polarity 2.1mm cable. Or, to power your Maxon RTD800 use a Current Doubler Adapter (part# PPAP, $6.00ea.) in Pedal Power 2 Plus output 5 and 6, DIP switches set NORMAL and one of the all black (standard polarity) cables supplied.