Experience with separation grid/separation network?

Hello together, I have seen that MB offers under the number B67660099 a separation grid/separation net, which can be mounted behind the 2nd row of seats, for example, to be able to pack the trunk under the ceiling on holiday trips. Depending on the dealer this is offered between 160 and 190 €. The images and descriptions found so far do not allow any statement about the stability of the grid, but rather allow the quality of a thin “flying grid” to be guessed – would of course completely a Bsurd. Does one of you have such a separation grid and can tell if the part is really robust and holds something back, if you have packed back (not too heavy) luggage up to the top and have to step on the brake properly? Sure, that the lighter things lie above, but also those my children in the 2nd row and later also do not fly around my ears with a full braking. How expensive is it to mount that part? Is this possible in a few handles or is the length I’m sorry, Robert, I’m sorry, but I’m sorry, Robert.