Nope, I use around the houses routing to use up slack, I orient the fan bodies/housings to the best position, sometimes to use the slack, sometimes to allow the full reach of the cable,
extending wires to route out of sight is another option though, not sure I would use the blocks you link, but I did wire four 80mm's together on a roofmod once, and the join was in the middle of the four,
the main tool is looking, and patience I'd say,
most folks don't go to my extremes as its too harsh, but for a cleanlooing case its always worth the effort, like when people have to ask where your cables are, or if that pic is before you wired it all up 😛
Moto