I went in through the PDM cover, connected onto the vehicle side of the bus bars that are bolted to the fast charge contactors, and used cable glands to seal the entry points (in the cover above the heat pump cable entry point). This ensures excellent electrical connections (poor connections will cause insulation failure fault codes)
The inside "roof" of the PDM cover needed the ribbing removed above the bolts and cable lugs to get good clearance (about 7mm clearance)