Question about Samsung Ms23k3515as/Sw

I used wooden bowls with fruit, vegetables etc.. No problem.

According to the instructions, a gap of >10cm should be left at the sides and rear and >20cm at the top for ventilation. However, there are no ventilation slots at the top. The sheet metal is relatively thin, I probably wouldn't put a coffee machine or anything like that on it. Too wobbly / will be dented. Or maybe a board as a base...

I also have several things on it and there are no problems