@VickiSoCal most of the schools where my D19 applied required two and allowed up to four, plus an additional non-teacher rec (mentor, coach, pastor, employer). My D also used different recs for different schools based on our judgement of what the school was looking for in its students. She had six recs and spread them amongst her schools and scholarship apps.
To talk about what @SJ2727 said, my D’s various recs did speak to different things, I think, because they came from different environments- a couple were regular college professors, one was an honors college professor, one a mentor in a college research program, one a privately- hired teacher/field expert, and one from a boarding school. They were also all from different areas and played to different strengths. If it annoyed the adcoms it wasn’t to the detriment of D’s admissions results- one, the one she’ll be attending, had four recs and requested a specific fifth be forwarded along during the process.