The short answer is they do not make any difference, keep using what you have.
Personal I feel that this is a terrible scam on audiophiles who do not have a real understanding on how routers/switches and networking work in general (which is most people). There is nothing in the digital realm that makes any difference in sound quality, the only time it does make a difference is when you are converting it to an analog signal, before that time there is nothing that is going to change the sound for better or worse. Routers and switches only operate in the digital realm.
Routers and switches are always transmitting a bit perfect packet to your device. It's in the spec, packetized transmission, CRC checks, re-transmits all are there to guarantee the file arrives exactly as is was sent. I have done lots of packet sniffing at my work, and dropped packets are almost unheard off in corporate (very crowded) networks. unless there is break along the way. On a home network, from looking at my own network, it never happens. I have over 65 devices on my home network, so it's pretty crowded, and I have never seen a droppe3d packet in over 15 years that I have had the ability to monitor this.