Nextbase seems to have the majority of the market, I think.
I have a front and rear APE setup in the car which seems to work well though I've not has the necessity to need it.
I have a front Nextbase in the truck (no need for a rear cam as there's a bloomin' great trailer following me everywhere.)
Make sure that the camera has decent Night View capabilities, if you drive in the dark a lot, which I do.
My car cam is screen mounted behind the rear view mirror and plugged into the powe socket. I have thought of hard wiring but have not done it yet.
The truck cam is removed daily as I'm in a different one every shift.
If dash mounted, make sure it doesn't obscure your vision.