I have mine coming out in the front wheel area, underneath the headlight. No need for drilling. Since the charging cable coms with a protective cap, and can be easily stored behind plastic molding, I have never had issues with water, even when riding in the rain, not to mention the washing. In addition, while bike is in a storing mode (winter, weather, etc.) the access is easy to hook up the trickle charger. When I am about not to use a bike for few days, I use bike dolly to stand it on: I can slide the bike around, if called for.
Merry Xmas, stay safe and happy riding.