I'm not too sure which forum to post this in but I'm trying to get hold of some reasonably priced wall outlets that can handle multiple RJ45 and/or RJ11 connectors.
Do a search for wall plates on these very forums and you should find a few responses over the last couple of days that cover this topic.
Have a look at http://www.mkelectric.co.uk they produce a whole range of different faceplate finishes and are able to use RJ45, RJ11, BNC, F-Type, BT Secondary. They are a little higher on the cost side but the quality is really good.