I agree with lehtv. It's not hard to route the cables. It just takes time. I installed my devices and did not connect any cables. Routed the cables from the motherboard and if satisfied, hooked up the other end. It took a little trial and error in terms of which opening was best to use.
I am not obsessive about cable management, but the R4 almost did the job for me. I also did away with running a molex cable all the way up to the fan controller with a molex to SATA adapter. It was $3 or $4 bucks.
Back in the day before modular/braided PSUs, I used zip ties. OP may want to use the ones that came with the R4 to tidy things up.
Below is a bad photo. But it does show how the R4 can look without being obsessive. Have two 2.5 drives on the bottom & both cages removed.