The pc does not have back compartment, nor anyway to attack the cable to. What I am thinking right now is to hot glue some zip ties to the centre gap between HDD and mb. And then zip ties the cable to the zip tie, so it runs down the centre of the pc cleanly and branches out to its destination like a upside-down tree.
Longer cables? It looks fine to me, mine looks like a magpie nest with SSDs somewhere in there not even screwed to anything.
there’s no SSD in this, that hard drive is in a bracket.