SCOTUS is show anyway.
https://constitution.congress.gov/constitution/article-3/
It don't say VOTE. it also don't say a limit on the NUMBER of Judges.
Article III
Section 1
The judicial Power of the United States, shall be vested in one supreme Court, and in such inferior Courts as the Congress may from time to time ordain and establish. The Judges, both of the supreme and inferior Courts, shall hold their Offices during good Behaviour, and shall, at stated Times, receive for their Services, a Compensation, which shall not be diminished during their Continuance in Office.