I am missing a small RB on a t-tail…
Would be great for industrial and some home installations
Edit: t-rail of course 
It’s the same DIN rail.
In fact, there is. LtAP mini https://mikrotik.com/product/ltap_mini with DIN rail mounting bracket https://mikrotik.com/product/dinrail_pro
For the hex (and similar) formats that are born with wall mount possibility it shouldn’t be too difficult to screw to it a couple “universal” DIN rail clips, example:
https://widgetlords.com/collections/accessories-for-the-pi-spi-and-pi-spi-din-product-groups/products/din-rail-mounting-clips
on the back, or, if you want it “front facing vertical”, a kit like this would do nicely:
https://www.robustel.com/parts/s052005-l-type-din-rail-mounting-kit-3-sets-screws/
Devices like the hap lite or ax lite are obviously a little more difficult to deal with, but it shouldn’t be difficult to adapt common L shaped/angle bracket(s) with DIN rail mounts like the above.
MT is not into this market. Any 3rd party mounting options are simply violence against innocent devices.
There are other vendkrs which have large DIN-mount device portfolio, one example is Moxa. Yes, it comes with a price …
Not if the device signs an informed consent paper.
And absolutly horrible from a software and management perspective
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If you have a 3D printer there are a few designs around like -
Mikrotik hAP Lite DIN Rail Mount Enclosure -
https://www.thingiverse.com/thing:5193941
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