What about a simple chamber for the meanwell?, open ended both ends, this keeps fingers etc out of the lively bits, but with one or two fans pushx1, pullx1 or both push and pull, this should take care of any cooling........ or even fix a finned heat sink on top as well.
I am about to start modding a case that is 165mm wide, 357 high and 305 front to back, so instead of the existing MB mount back wall I will have a cut down Lian-Li MB slide out tray from an old PC-60, this I intend to give me variable positioning front to back, so variable sizes for 2 x chambers,....IE. Larger CPU cooler,= smaller rear chamber, enough for cabling and SSD etc, ........Low height CPU cooler = larger rear chamber, room for such as the Meanwell to be mounted.
Could also drop the MB mounting height to leave room for 2 x 120 fans under top, so extract from both chambers at once..........
Not decided on anything exact yet, but nice to have option for the Meanwell unit amongst other things.