Install LibreELEC on a partition rather than on the whole HDD

Latest MacOS Sierra has brought some damage to the sound output so I’ve decided to install LibreELEC instead of KODI as a MacOS app. I would keep LibreELEC on a dedicated USB stick but this way it works terribly slow in terms of updating the library. I wonder if it is possible to use only a dedicated partition to install LibreELEC or it should take the whole HDD only?