It's not easy finding a place to store a large anchor on the Sonic 31ss, under the rear seat it fit nicely but it didn't seem like a good place to have a anchor bouncing around. I used Dry Dek on the floor of the storage compartment contouring it for a tight fit around the battery mounts to keep it from moving side to side. Then I used 1" nylon straps that I mounted looping under the compartment floor cover to hold down the anchor. It is now firmly held in place against the floor. I also mounted the stern light and cockpit cover pole to the forward side of the compartment. To prevent the aluminum poles from accidently contacting the battery terminals I installed battery box covers from Diamond Performance parts (supporting vendor of this site). Looks nice now... but it's covered by the rear seat! Although, when I get out that polished box anchor with the red rode, everyone seems to notice.
Before
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After
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Matching red step plates and cup holders
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Maybe it will go faster now...