I'd be more worried about the stability of the glass than the output of the panel. I've not had first hand experience of damaged solar panel glass, but I do know it's tempered glass, which tbh I'm surprised didn't shatter when you drilled into it.
To mark the holes for drilling solar panels, use a dry erase marker. Once you've got the solar panels placed where they're going to live permanently, mark the mounting holes with the marker. Make sure you double and triple check everything is where you want it before drilling holes in your ceiling.
Installing solar panels on a tiled roof requires drilling into the tiles to attach each mounting bracket. However, drilling into tiles is not recommended due to the risk of breaking them and potential leaks. If you still choose to drill, you assume the risk at your own expense.
I had a rock or two off a mower (I'm guessing) blast two of my panels once. Essentially shattered and spider webbed the glass and put a big divot in the panel where the rock hit. If not for the backing, it would have gone right through. But then it evidently bounced or maybe another smaller rock hit the adjacent panel and cracked that one too.
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