What is your advantage to Library server than just sharing the Library? I haven't tried Library server in a while but found it slower than sharing the library and seems like on the older MC it would not play Video-TS.IFO files or something like that. I think it now plays the IFOs.
Anyway, if you are trying to keep it read only what I do is share the library. I always start the instance of MC that I want to have the read/write access to the library first. The rest that access it after that are read only. To share your library just point or add a library for all you MC instances to the same library directory on a shared network folder. You may have to replace all your file locations in the shared library using the search and replace to the network share vs the HD drive letter so they show up as \\Office\Media\Music\...