Man this reminds me of the episode of The Office where Michael was broke and he yelled out "I..... DECLARE.......BANKRUPTCY!!!!!!!!!"
Thinking that by yelling it out loud, or "declaring" it would be valid enough to make it happen.
Just saying that it doesn't void your warranty on the internet doesn't mean it won't void it. You really should call up your local shop and straight up ask them if you want a definite answer. If you do have any issues, you can bet your a$$ that the dealership is going to do whatever they can to say that it's not covered, or it was caused because of you drilling the holes.
Sure, it's unlikely that it'll really do any damage to anything, but if it ever came down to it you might be the one fronting the bill for a costly repair. But like I said, odds are pretty slim of that.