Discovery 4 triple 12v outlet
thingiverse
It's a pretty tight fit and a pain to get to as the armrest box needs to come out to wire it, but the finished result is good. While doing this I also moved the aux socket to be under the cupholders, and permanently powered and connected an aux bluetooth adapter inside the gear-lever area. I user standard 12v outlets you can get on amazon or ebay. The fuse for these is 20amp so more than enough to take a few USB accessories (even let's say 3x 30w pd chargers on at the same time).
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