Question about Digitus 48,3cm 19inch wall cabinet 16HE SoHoline RAL7035 grey H816mmxW600mmxD450mm with glass door

The cabinet has a pre-milled opening in the sheet metal at the top and bottom and you can "break out" the piece accordingly, depending on how the cables are fed.

The size of the opening is rectangular and quite generous, the question is not whether there is room for all the cables but rather how to close the part so that no dust gets in. I can't measure it right now but I estimate the size to be "the size of an iPhone XR". Hope this helps.