I'll second the
70mai Smart Dash Cam as a great cheaper alternative, it's discreet, simple and works. Last time I bought one I paid about $55 on ebay.
Personally, I have 3 of these (mine, wife and daughter's cars). All working flawlessly. Access to the videos is via the phone app. You can have multiple cams logged to the one app. When you want to review video just connect to the required cam via it's inbuilt wifi.
If you are wanting a rear crash cam too, my tip would be to just buy two of them for the same car. Two smart cams costing about $100-120 for the two.
You could up the ante even further and opt for the
Dash Cam Pro version with extra features ... particularly in an older cars, with the added GPS module, it gains you forward collision and lane assist (they call it Adas) all for about $110-120. Now that is a bargain!
Maybe even go with a Pro upfront and a Smart at the rear.
Wiring is dead simple, either plug direct into with a 12v car socket (adapter included), or be more creative and to get hidden setup underdash with a fuse tap etc..
70mai is Xiaomi car technology brand, link;
70mai – Leading smart car electronics
Buy them mostly on amazon, ebay, aliexpress.
All the best.