Hifi amp in rack

I know this isn't sound system talk but still speaker related.

I'm in the process of fitting ceiling speakers in some of the rooms in my house and will be having a separate amp for each room. I'm only using hifi amps and chromecast audios for each room but want to rack mount the amps if I can.

I've seen some denon amps go on ebay recently that have a rack mount casing around it, I was just wondering if anyone knew where to get these. They look around 3u in height

Thank you very much that looks about right. This is the one I saw on ebay, almost looks like it was made for the amp with the frame of the shelf going all round the front but this 3u shelf looks perfect