After reading so many reviews and looking up so many dash cams, I settled on Thinkware U1000 with an external battery.
I had initially decided on F770 but it was out of stock and I didn't want to come back later. It would be sufficient for me since my car has a lot of 'assist' softwares already.
Now I am getting beeps from both the car and the dash cam, which is not too bad. The volume can be turned down.
But what is rather disappointing is the motion detection message tells me that someone is close to the car, but I can't see him/her since the camera is for front and rear only. So if some creep scratches my car doors or bangs the side while opening their door, there is no record. What is needed is a 4 channel unit. My reviews say 360 cameras do not give good images. So I have to wait.
But I am happy with the audio, it catches voices outside. The hotspot is difficult to connect, wifi is easier. I am glad for buying the external battery, no flat car battery worries.