Grinding/milling terrace concrete? 2-4 cm, no slope

But with a concrete grinder, just like with a parquet sander, you can't create any slope in anything. Flat sanding is certainly possible. 0.5 cm is not a big hurdle. But sanding a large terrace surface with a slope and then still roughly even, 2-5 cm thick, I rather don't see that. If things go badly, you might even cut into the steel reinforcement at the front. Then it's better to try to create a slope in the tiles. But that only works if there is enough height at the back near the door.