That sounds like the best approach to me. When you do add a clip drill and tap one hole first. Attach the clip with the one screw, then drill and tap the second hole using the clip as a pattern. Attach the clip with two screws and then drill the third hole. It's a bit of a pain doing it this way but, if you do, it all but guarantees that the holes will align properly with the clip. Trying to mark the hole positions and drill them all at once would be a losing proposition for most new makers ...
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