Sounds cool. I put my EZ pass back there zip tied. You can't see it.
I also put many lights in the grill of my Jeep Wrangler without issue.
There are so many computerized monitors on the Discovery Sport which makes me hesitant to add any electronics. It may think the draw of power is an issue with whatever you tap.
It is a cool thought though. Maybe even a scanner in there like Knight Rider. Ha.
That is my hesitation too. I haven't had any real issues (knock on wood), so I don't want to jinx myself with some mods.
Speaking of EZ Pass... how did you get it back there?