I don’t think it makes any difference if there are multiple apps from same school. I know Harvard took an unprecedented 9 kids from one of my kid’s High schools one year. I’ve seen multiple of ED kids each year from my kids and these are small selective schools. But if it makes you and your student feel better, strategize away.
Ask your student to talk to the GC. At my kids’ school, certain colleges were encouraged as there was a good working relationship between the GC and the Admissions office. GC loved delivering those ED apps to those schools. Done deal early, win all around.