After two fail print (was playing with very low filament flow for support, didn't work, but also means it was printing in mid air for hours), so was great motivation to get that setup.
This will mount on the chain setup, as pictured.
But the spacing of the mounting holes is the same as the extrusion (20mm), so can also mounted on the metal frame using t-nuts, for instance at the very top of the printer frame or anywhere you see fit.
This is the exact model I have:
https://s.click.aliexpress.com/e/_DEPx9dZ
https://amzn.to/3UHO5WW
I haven't installed it yet, but wanted to share it asap.
simply remove the cover, and install the printed one, reuse the stock screws.
And then two screws to mount it somewhere.