Hi Technoir
with regards to buying a cabinet to fit the NVR, I went out and bought one after measuring my NVR which has the same measurements as yours.
The cabinet I got was a 9U, 19 ich rack cabinet. which was 570 wide x 450 deep x 500 high. thinking that my NVR was 322 deep that it would fit nicely inside.
However, the measurements are the outside diameter and not the inside
So, the inside is designed for a 19-inch rack, edge to edge, so roughly 484mm. and rest of the space left over is to allow wiring of around 50mm at each side.
so with regards to your switch once you fit a 19-inch shelf, you might just be able to squeeze it in, because mine has a maximum width of 440mm.
And now comes the depth issue that got me into a world of pain. shelf I ordered was 300mm in depth, which considering the cabinet was 450 deep (outside) after fitting the shelf I had only 50mm at the back. Which was ok to allow for wiring. And 50mm at the front to allow cables to plug into the patch panel.
And my NVR only been 322mm deep sat on the shelf nicely, all was happy days until come to putting all the cables into the back of the NVR, mains cable, HDMI and all the patch panel cables for the cameras, the mains cable once inserted into the NVR stuck out roughly 80mm from the back. So, the NVR was over hanging the shelf at the front and right to the glass door more or less.
So, my option was to buy angled down power cable, and an angled HDMI etc., so it fitted nicely.
Ok it would have fitted but buying the angled cable made it fit better and also look smarter.
therefore if I was going to buy again, I would go for a deeper cabinet, maybe a 600mm deep and buy 350mm or 400mm shelfs. At a push maybe a 550 cabinet and 350mm shelf.
now going back to your switch, if it has brackets which to fit on the side for a 19 ich rack you should to ok, and depth wise, mine is 500mm with is a 9U I believe. Which gives me room for 2 shelfs and 2 patch panels plus room for cable tidy and little space at the bottom.
In hindsight, I probably would have gone for a 12U to give a bit of future proofing for extra snuff.
Apologies for the long-winded novel. However, it was the best way I could try and explain the situation. Hope this helps and will try and upload with some photos later.