Naysberg: There is no source anywhere whatsoever for the popular idea that L’asid Lavo we Pasken by Beis Shammai.
And I think there are six (plus 18) quoted in a Tosfos on Sukkah 3a if I recall correctly. It’s those 6 plus the Shmoneh Asar Davar in the end of the first Perek of Shabbos.