Ikea Lack 120cm desk shelf / riser

I used 6 screws to fix it 3 on each side, the screws are like the one shown in the pictures and the thread size is 5 x 24. I guess a good double sided tape can also be used. Please keep in mind that these ikea lack shelves are filled with cardboard and not wood, so don't tight the crews too much. I printed mine with 0.8mm nozzle in PETG because I didn't care too much about the layer lines, I just wanted it to be strong since I am putting 3 monitors on them. But I 0.4mm nozzle can also be used just increase the amount of top and bottom shell layers. Cheers