Add-A-Circuit 10 amp max?

Retrobmx63

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08 Mazdaspeed3 - Black Mica
I was looking into using one of those add-a-circuits to hardwire a radar detector. A lot of people seem to have used it and love it. It seems like a great way to do it without splicing, etc.

My question is that every one of those that I find say it's only good for circuits that are 10 amps max.

Does that mean you can damage something if you use it in the cigarette lighter fuse slot in the Mazdaspeed3, which is 15 amps?

If that's the case, where have people been putting it for switched power?
 
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