The GoPro HERO Overkill Dual Mount by Zkulls allows you to mount a GoPro on front of your helmet with an additional camera (video or photo) on top of the helmet.
It comes with a solid velcro strap to hold stills cameras on heading and the anti twist solution.
For video cameras, the plate comes with an anti-twist pin.
With the HERO Overkill the camera is secured with a hard mounting and held by 2 bungee straps around the body.The Hero camera box can be opened (to download footage or charge the battery) by flipping it forward without unscrewing the camera from the mount. Cables can run through the plate to avoid drilling the helmet to route switches.
The HERO Overkill can be mounted directly to any helmet with a flat-top section, or it can be mounted with a separately available Zkulls3N Attachment System mount to make it into a quick-release mount.