Looks to be a nice kit, but no way in h3ll am I mounting stuff/implements next to my head, or placing it where a rear seat occupant will face-plant the stuff if in a wreck or something else. I don't put stuff on my dash either, except for my ballcap. Aboard ship stuff that isn't secured somehow and can cause damage (bodily or structural), was always referred to as a "missile hazard" for a reason. Additionally, someone with ill-intent who sees it mounted to the headrest might just decide to steal it.
Yeah, I know. A lot of "what ifs", but better safe than sorry.