Brodit clip arrived today. Install took a few minutes longer than planned as I hadn't pushed the 2 x gap wedges in far enough and the end snapped off of one

Still managed to get them both in far enough though and inserted the clip itself. Quite a tight fit of course and required a little shifting towards the middle slightly in order to ‘latch’ into the trim gaps on the underside of the dash.
Just need the holder now and then wire in hidden USB power source - which I think is going to be placed next to the glove box, along with a very short USB power cable.

