I have never used them either. Like Dave I try to keep power and low voltage lines separate. You can get standalone surge arrestors for RJ45 connections. They range from cheap that would be as good as the power strip ones to more expensive that use gas discharge tubes instead of MOVs for protection.
https://www.ebay.com/itm/RJ45-Adapter-E ... SwYHxWPBqUhttps://www.amazon.com/Tupavco-Ethernet ... B00805VUD8If you are using any devices that use POE (Power Over Ethernet) make sure the arrestor handles that.