Here's the latest (2017) Motorola R56 guidelines : https://wiki.w9cr.net/images/4/4a/68P81089E50-C_Standards_and_Guidelines_for_Communication_Sites_R56.pdf
And to answer the OP question "Do arresters work?" yes, but how and why they work is largely misunderstood. Here's a short description for the lay person : https://noji.com/hamradio/pdf-ppt/noji/Noji-Article-Lightning-Arrester.pdf