Cheap materials to practise hockey on?

Hi everybody, the club I play at isn’t going to be open over summer, and I want to be able to practise my control while at home.

We have a garden with plenty of room (both grass and concrete), but the grass is very uneven and thick so I don’t think it would work, and the concrete is slanted plus I don’t want to damage my stick. Do you guys think a square of random carpet would work? What material would you guys recommend?

Thanks 🏑😎