HifiBerry MiniAmp not showing up

Hardware
1

Hi! Newbie and on my second installation of HA. Setting it up for a friend needing a smart home and powering some old passive speakers embedded in the roof. Planning to use Spotify Connect. After plugging the MiniAmp from HifiBerry into the GPIO pins it doesn’t show up in the hardware list.

I thought this thing was just plug and play, but it seems that I’m missing something and HifiBerry does not have any usable guides, as far as I can tell.

2

I doubt that is possible to address/see the hifiberry directly.
I’m using a few of them on RPi’s which are installed with Picoreplayer and they are visible as Media Players in HA through the squeezebox integration.