I don't believe Zen have launched self-install FTTC yet.
There is of course the wholly unsupported route... That is, you have the BT engineer fit the new socket and modem, and then either just plug in your own, if the master socket is where you want it or if you wanted to use another socket, remove the master socket "overplate" they install (you will need some other screws to hold it in). Then, use microfilters as normal and locate your own VDSL modem/router.
If you have an engineer installation, it's best to get the master socket moved to where you want the VDSL2 device if the engineer is agreeable, or to get a Data Extension Kit run from the master to where you want the VDSL2 device (should be free if the cable run is less than 30m and the cable route is relatively simple - make sure Zen specify the Home Wiring Solution on the FTTC order).
If you want to site the VDSL2 device remote from the master on an existing engineer install, I would argue it is far better to run a data only extension over good quality twisted pair cable from the IDC block on the faceplate filter (the top right item in MrSaffron's exploded picture
, the block is arrowed yellow in the thumbnail
Extending over twisted pair cable from the IDC block on the faceplate filter means that the extension wiring is filtered. If you remove the faceplate filter and use microfilters, the extension wiring is not filtered, also there is the possibility of someone incorrectly removing a microfilter.
I'd suggest leaving the VDSL2 device at the master socket if possible, in order to maximise performance.