Making all custodes point up

It's possible to make all custodes point up by setting the neutral-position property to a high enough number.

\version "2.25.30"

\paper {
  indent = #0
  ragged-right = ##t
}

\score {

  \new Staff \with { \consists Custos_engraver } {
    \override Staff.Custos.style = #'mensural
    \repeat unfold 3 { e''1 \break }
    \override Staff.Custos.neutral-position = #20
    \repeat unfold 2 { e'' \break }
  }

}