Question about Icy Box IB-MS314-T

Yes, you can turn it vertically if the screen is not very wide and there is space from the middle of the screen to the bottom of the table, max 35 cm, so for a screen with a width < 70 cm it should be just fine, but you still have to look at the weight.
My 34'' Samsung screen is just over 70cm and I can't put it vertically (I don't need to and it doesn't make sense for such big monitors, otherwise you need a ladder to see the upper half :-) )
My dell 24'' screen, however, I can rotate and set vertically without any problems.