One of the primary problems with the stock screen is its resolution, its very low so the quality is typically poor so the display quality of your phone mirrored on the screen might not be the best, especially for watching streaming content such as Netflix etc...
I had an Aux setup wired into mine to display my phone and play audio, the audio was fine but the screen was pretty much unwatchable.
The alternative some people have taken is to wire in a Raspberry Pi to give more control over the picture quality but even then the results have been disappointing.
As someone who's been down that path I'd advise you to forget about the stock screen and invest in a good Bluetooth double din Android head unit, despite the extra outlay it'll be a much better result.