"Do not mount with the two holes, If you have a mishap it will brake the ignition, I mount mine with velcro and drill two hole in the plywood, Put pull ties to hold in place"

I thought you have to put some sort of foam between the Module and Firwall to reduce Vibration, the method you describe, places the Module Directly against the Firewall; I would agree with the Zip/Pull Ties, instead of the Velcro a piece of Foam; then pull the ties snug and that would hold the Module in place, and the foam to dampen the vibration, I hope this is correct?