Excuse me for the beginners question, but what is the reason to use either /opt or /usr/share as root folder for the spreed server? As I remeber reading somewhere the one repo available installs it to /etc. I don’t know what the intention is to put something into one or the other predefined folder of linux systems or what rights/security reasons are there about this, so some explanation would be nice 
. Reason is that I want to write a small guide about how to establish a systemd unit to autorun spreed.
€: I self explained it to me by reading http://unix.stackexchange.com/questions/11544/what-is-the-difference-between-opt-and-usr-local#11552. According to this I would also slightly prefer /opt/spreed-webrtc-master as root, as it is downloaded manually here and no files are created outside of this folder by any step.
€€: Guide about setting up a systemd unit for autorun the spreed server is done: [Spreed.ME] Howto autorun "spreed-webrtc-server" step-by-step