SLK 280 Utopian insurance contribution

Hi, since I may be known (purchase of a SLK 280) I am close to the purchase. Now a blow hit me today! Since I have a company and I am self-employed I wanted to report the SLK 280 as a third car of course VK to the Allianz. Since my other two cars (BMW 520d, Mercedes Vito) are quite cheap in the insurance, I thought of a “normal” price range. The alliance man made me an “offer” in the amount of 7109.09 € annually and d He said that this was a luxury class (SLK) and the engine was also quite happy in the insurance, because 231ps and 3L displacement. What decides except that he is third-party car in the contribution? That I park him publicly or where is really put on it with the contributions? How are for example CLK coupe, A5 and 3er Coupe taxed? Are these like the SLK on “Coupe” thus “luxury class” to be found or are the quite normal cars, which like my 5er completely “normal” handle So 7,100,- I don’t spend every year in life, I can afford a new VW Polo every year with the insurance contribution. How do you see it? Do you pay as much and it seems to me as much or what is going on? please clarify me.