There aren't wheelclamps specifically for alloy wheels, apart from the Al-Ko hub fitting type.
The overall tyre diameter and width are the usual constraints but shape of the wheel arch may also dictate which type are suitable.
When you take delivery, try your existing clamp to see if it'll fit satisfactorily.
If you do need to get a new one, use the Sold Secure grades (Bronze, Silver, Gold and Platinum) as a guide to security but bear in mind that the most secure wheelclamps are also the heaviest and most awkward to fit as well as the most expensive.