I would've just bought the adjustable proclip holder and a bracketron suction cup mount for the windshield. The bracketron is pretty thick and solid so it shouldn't be prone to vibration and has the fully adjustable ball and tension clamp for a bit of maneuverability. It also has a standard amps mounting plate which is perfect for the ProClip holder. The adjustable can be adjusted so it puts a nice press fit on the Epic so it won't budge even if you roll your car. And if you roll your car and it does fall out, I'll give you a refund
The ProClip holder is also completely open around the camera so no drilling or dremel work needed.