Hi,
The Bosscomm boxes are good and I've used a few on my network, but you can just as easily buy a terminal block/strip from Radio Spares or Maplin and splice MasterLink very successfully.
I've done this to great success and actually think it gives a better long term connection than the push-fit wire sockets on some connectors.
Just make sure you then put the connection block in a small earth screen box.
Best
Rob
BV7-32, BL8000, BL2, BL6000, Humax, AppleTV3, MX4200, V8000, Humax, BS3200, BL6000, BL4000, BeoPort, MacMini+DACmagic