Why mod a new car? Keep it stock and untouched by local mechanics as long as you can and you will love your car for being trouble free as long as you keep it.
I was too disturbed to get a security alarm installed in my zero meter cars and I have made it a rule that none of my future car will ever get any after market installation.
Once door panels, pillar and footboard plastics are removed and dash is opened, it would be never be same again, keeping in mind the quality of hooks and hinges and screws used and the poor workman ship.
In my office I have seen over the years that the cars which had after market installations developed problems after sometime, but the stock cars which never went to get any installation remained trouble free.