With Multi Room TV you will have all your video sources (e.g. Sky boxes, Virgin Tivo, Apple TVs etc.) stored in the rack in your central location. The device the sources are connected to is called an HDMI matrix. They typically come as 4×4 or 8×8 (and other sizes are available too). 4×4 means that they can take four inputs and route these to up to 4 televisions.
The signal from these devices are then sent out to the various TVs around the house over a CAT6 cable. You get multiple benefits form this approach.
First of all you avoid having to have all the equipment in the room, i.e. no unsightly Sky boxes on show, no cables to hide etc. It also means that you can share the sources boxes across multiple TVs, so even if you only have, say, one Apple TV, this could still be used for all the connected TVs.
A perhaps even bigger benefit in today’s world of 4K resolution for TVs: With Sky Q you only get one box that can do 4K (The Sky Mini boxes will only do 1080p). With an HDMI matrix you can send this 4K signal to as many of your connected 4K TVs as you will, simultaneously if you want.
Do be aware, though, that each Sky/Virgin box can only send one channel at a time. So if you have two TVs selecting the same Sky/Virgin box they will be watching the same content. That is why you often want to have 2-3 Sky or Virgin boxes in your installation. Who gets the 4K signal is up to your family dynamics to decide! (i.e. does the footie win over Game of Thrones?).
Having the sources in your rack, where you would also be housing the amplifiers for your multi-room audio system means that we can easily extract the audio from the sources and get it playing through the ceiling speakers throughout. This can be nicer than using the in-built TV speakers.
Finally, it’s worth thinking about what video sources you might want to use in the future. Yes, that is almost impossible to guess, but at least with a multi-room TV system with an HDMI matrix it should be relatively easy to install a new source in your rack and connect it up to your video matrix.