I want to put my NAS in a small cabinet. I do not want to hang the cabinet to the wall, for a few reasons : there's no stud where I want it to go, the wall is plaster board, and toggle bolts require large holes. Since I'm renting, that would be too difficult to patch when I leave. Also, the plaster board would just amplify the noise
So I'm thinking of hanging it from the ceiling, which is reinforced concrete. I devise two ways for this. Which one do you think it's best?
First method : mobile with line/chain 
Second method : fixed with threaded rod. Secured with nuts and washers (blue) on top and bottom.

Note that both are using only 1 hole in the ceiling, because I want it to be minimally invasive.
For that, I'm considering using this type of bolt : https://www.hornbach.ch/de/p/messing-spreizduebel-msd-m10-34-25-stueck/8229615
(is it called brass anchor?)
I'd get the M6 size, or even smaller if I can find. Because the total weight to hang is 5 kg / 11 pounds. Might go up to 10kg/22lbs if I add some more drives in the future.
So, what do you think? I'd any if these preferred? Or any other suggestions?
Thank you!
Edit : I'm attaching a photo of the wall to illustrate why I'm reluctant to pierce it. It has this extra layer on top of the boards, about 2cm thick) and with non uniform look. So holes will be very very visible even after patching, since you cannot sand it
