I have had a nextbase connected to my obd port on my ex30 for 6 months now, with no issues. I need the parking mode active as had a car crash into mein when it was parked and that was off the scheme.
So need the security just plugging in the 12v doesn’t give. I remember on the golf I had back in 2017 vw gave me a odb doggle. That you paired your phone to. I forget now exactly what it did but it was permanently transmitting and didn’t cause any issues. The 622gw I have now only has a tiny internal battery and it replaced a 22x. I have got it as it has the rear camera mounted to the actual dash cam. so stops the need for running the wiring for the rear camera. also the ex30 only has 12v in the boot and if you have stuff in the boot, well its going to get bashed a lot
So really the obd port was the only viable option. plus it has the low voltage cut off.
EX30 SMER Ultra