Tesla has opened preorders for a wireless charging mat that can accommodate up to three devices placed however you want, and that comes in a form factor “inspired by the angular design and metallic styling of Cybertruck.” The gadget is called the Wireless Charging Platform, and it costs $300. For that hefty price you get the mat, a removable magnetic stand that lets you prop the pad up at an angle or lay it flat, and some tech that we once called “the most promising AirPower…