Suggestions for LMS setup

Hello to all,

I would like to start using LMS and some RPi that should act as players around the house.
Actually I have a Plex server, but it is not at home.

Is there a way to have a local LMS without music that interacts with an external PLEX to get music from it?

In case it isn't possible, could I install LMS on a public server? In that case, how are the local players discovered?

Any suggestion is much appreciated!

Thanks,

Simon