Isolate The Stainless Screws
One of the best things you can do, in order to ensure your anode stays put, is to apply a liberal coating of Tef-Gel to the entire SS bolt that passes through the anode and also to coat the anode surfaces where the bolt passes through it and where the bolt comes into direct contact with the anode. If your anode has a recessed removable nut, do the same for the nut.
The practice of applying an insulating compound creates a spot where the stainless bolt or machine screw will be galvanically isolated, as best that it can be, from the anodic metal.
Stainless steel is near the top of the galvanic scale and zinc, magnesium or aluminum, the common anodic metals, are at the bottom. Coating the anode and stainless bolt or bolts is really not optional, if you want the best anodic protection & performance.
Here we can see a zinc from a feathering prop that had the stainless bolt and inside of the zinc liberally coated with Tef-Gel during the installation process. The anodic material around the stainless bolt was completely unaffected, as it should be, and the asnode is eroding very evenly, where it should be. This image was captured exactly as the anode came off the boat.