Can't tell you much about binding, but if you only want to serve to about 10 users on a LAN, get FMPro Server and run it on a standard Mac OS machine - which should run nothing else at the same time - as the previous poster said, no filesharing. Just a plain vanilla system with as much turned off as possible.
My guess about the binding would be that you don't need to do it with Server, as the Server is optimised to look after multiple files and clients on a LAN. Serving over the Internet or a WAN - maybe you need Unlimited and binding.
My experience is, if you need to do maintenance you can grab the copy of your files that Server will make periodically (you can set this up as you need in the preferences). Once you've edited this, you may have to re-import your data if the users have been changing stuff in the meantime, but you shouldn't have any problems otherwise.