Front/rear dashcam is always in the top 5 of my recommended mods to anyone. They are more important than a radar detector for sure.
Parking behavior is very important feature to me. I put the Viofo A129 F/R in my Mustang and it has been great. Very smart parking modes, very automatic behavior. Cost is about $235 for the camera, parking power wire, polarizing lenses, remote button, install kit, etc. 128GB card ~$40 more.
I have yet to buy another one for the ST, but it is on the short list.