Seven Branch Menorah for Shabbat?

I grew up in a standard two candles for shabbat family and have kept up the tradition in my current home. My wife isn’t Jewish and came across a seven branch Menorah (i.e., not for Chanukah) and was asking about it.

I’ve been doing some googling and it sounds like it represents the seven days of creation – six equal height with one elevated for the day of rest. Has anyone ever used a a menorah for shabbat as an alternative to the two candles (observe and remember)? Are there any laws or customs I should be aware of before adding a seven branch menorah to my home?