M5AIO

So here is the problem, I run amateur radio in my Karoq, it can draw up to 20 Amps @ 13.8V and it needs to be as clean as possible (no horrid voltage spikes or noise). The usual solution is to run a supply direct from the battery into the cabin via fused Pos and Neg cables. The problem with the Karoq seems to be that there is no visible cable grommet I cn open a new hole in to bring the cables through. There must be one somewhere but I cannot locate it. When I was younger I might have crawled underneath but nowadays I am not so inclined. Have anyone got any clues please?