In all seriousness, a dash-cam can save your bacon. The fuse blocks in some cars have spare slots for after-market devices. Routing the wire can be a real challenge. I suspect they don’t include instructions because every car will have its own routing needs. My son got a shop manual for his card; and, that provided clues to where wiring channels were located.
I had a nudging feeling telling me to get one 6 months ago
A gal backed into my car on a city street - no cameras at intersection
I would NOT let her go and dialed 911 - the police didn’t want to come but I told them we were blocking traffic (we were) and there was no shoulder (there wasn’t).
I was NOT going to move the cars before the police arrived. Fortunately she admitted fault (I was impressed by that) - but still can’t get parts for my late 1990’s car - which really sucks). I bought TWO dashcams after that - but both of my cars pretty much down now - they are drivable but one has that front-end damage. Still trying to find parts.
Oy vey
Junk yard has a hood but I can’t deliver it to the shop - plus ya gotta pay which is more difficult now that I’m not working - when I was working - even part-time, it was hard to have time since I worked overnight and slept days.
I going to attempt to move forward on one car this week.