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In 2013 I bought CTEK model 3300 for $50, which is the same one sold by the GM with Vette logo. See they are now $56 on Amazon.
Both need the accessory that is available for ~$10 that is the male plug to fit the rear Vette receptacle (or any cigarette lighter receptacle.) It connects to the plug from the charger.
Black and Decker has a good maintainer for $20. It comes with alligator clips, lighter plug, and ring terminals. I've used one for several years, no problems.
i have my Battery Tender connected under the hood. i dont use the CTEC that came with the car. i dont like my rear hatch open, i prefer my hood open. Been using this method for years. Just my personal preference.
Black and Decker has a good maintainer for $20. It comes with alligator clips, lighter plug, and ring terminals. I've used one for several years, no problems.
That is the one I have and it does as good a job as any. One doesn't have to pay a lot for a maintainer. That is just my opinion. I have used mine on several cars for years now. I think I paid $25 for mine at the time at Walmart.