I have my AMS's on a shelf below my printers. I originally designed a downward mount for the normal AMS Hub, but the Hub doesn't point all 4 of the PTFE tubes straight down, so it made a more curvy path. To make the path as straight as possible I have designed this mount which uses the “AMS Hub using A1 AMS Lite Hub - Buffer Housing” model here on MakerWorld to use the AMS Lite Hub so that all four PTFE tubes point straight down. There are several remixes of the AMS Hub using A1 AMS Lite Hub. I tried several and this is the one that worked best for me:

https://makerworld.com/en/models/149209#profileId-162781

Requires 2 - 3mm x 20mm machine screws, and 2 - 3mm nuts. You will also need the stock 3mm screws that currently hold your filament buffer.

You will need an AMS Lite hub as well.

https://us.store.bambulab.com/products/ams-lite-filament-hub