If you are happy having the router at the master socket then one of the BT NTE2000 faceplates will do the job.
Your extension wiring will need connecting to the IDC connections on the rear of the faceplate and will be filtered i.e. there will be no DSL signal on any of the extensions - so no need for any dangly filters.
If you need the ADSL signal on one of the extensions then something like Clarity's modified NTE2000:
Which provides connections for both filtered and unfiltered extensions. i.e. you would just connect the one extension you want ADSL on to the unfltered connectors and the rest to the filtered.
I have heard mixed reviews about the Clarity faceplate in terms of DSL performance - but I've only used one once and it worked just fine. Never had any problems with the Pressac made BT ones.