Ive been using Plex for a while now and i am having some issues with my LG smart tv that i haven't be able to figure it out and I'd like to give Emby a go, but i don't know if i install Emby is going to mess up with my Plex metadata or corrupt somehow my plex media server.

Any thoughts about that will be really apreciate.

Thanks 

Completely separate apps, one will not (can not) interfere with the other unless you start removing media from one that the other still wants to access. You might as well try Jellyfin too, for the trifecta.