I'm probably the last person to answer this question, so my answer carries all the authority of "something I read on the Internet". But I do have a source:
http://robotics.hideho.org/data/firs...Controller.pdf on page 16 states, "The Solenoid Breakout
● Has 8 solenoid outputs.
● Completely eliminates the need for Spikes for pneumatics.
● Can drive 12 Volts at up to 0.75 Amps per output."
So you might not need to use a Spike.