Help with Chord chart

I am using dorico 5 and been exploring the 0-line stave for chord charts.
managed to import the zip file from @benwiggy but i only see the 0-line version named as piano, shown here:

I dont need a one-line stave anyhow, besides i know how to create that.
i’m nearly there but dont know how to get the chords in the middle of the (invisible) stave. As you can see, they are over the top as would be in lined-staves:


Can anyone tell me how to get them lower (in the middle of the stave) on a per-player basis, ie just for the chord-only score.
thanks