I've also installed a number of Android car Stereo's (1 was a Double DIN Pumpkin, another a "generic" Chinese Flip out stereo). They are all pretty much the same, just different branding.

Also integrated Reverse cameras, OBD2, DAB radio etc. Installed into a Volvo and Smart car (Mercedes).
The UI was quite similar across them all. Don't expect software updates to work. These Stereo's do the job, bit clunky, but good enough.

TORQUE was the No 1 OBD Tool that I found to consistently work. Came with several customizable screens. Would give you Coolant temp, Engine RPM, GPS Speed, etc etc.
There are other App's available that turn your Double DIN display into a full size digital HUD display - Showing just your Speed and Lap timer etc.

The OBD adaptor I used was called " Streetwize OBDII Code Reader for Android and IOS ". Worked well. Had both Bluetooth / WIFI built in.

The USB DAB adaptor that comes with these kits uses a small antenna, about 5 inches long. Sticks to your windscreen. Not great reception, plus would quite often lose reception and you'd just hear static.
DAB-Z was one of the best stable DAB radio App's I found.

If you use a GPS App on the Stereo it'll need a cellular / data connection to be able to report live traffic information - even for navigation (WAZE for example). I used my mobile phone as a hotspot and connected the Stereo to the phone over WIFI..... good while the phone had charge!!
You can also install App's onto the Stereo from the Play store. Again, you'll need to have a WIFI or cellular connection to achieve that.