This is a revision of my mount for my scanguage 3 in my 2021 MB sprinter. I had to revise it to allow me to see my review mirror since I added an always on Wolfbox camera. This housing is inserted into the area that usually holds your sunglasses in your VS30 (2019-up).  Here is a video on how to remove the overhead control panel. 

I have included a drill guide template. I ended up using M5 Heat sunk threaded inserts and left over M5 bolts to mount the housing to the overhead unit. There is a small defect in the 3D print that I'm too lazy to fix and it isn't visible when the housing in mounted. You will need an extension for the cat5 cable to reach the  OBD2 port  under the driver side dash. I removed and then reattached the driver side A pillar trim just to have cleaner cable management.  I finally got an enclosure for my A1 printer so I printed this in ASA to withstand the hot summer days. It's not the cleanest print, but works fairly well considering  I don't have a scanner and have to do everything by hand measurement. There is a hole for the cat5 cable and a recessed area for velcro. I think the fit is tight enough the scanguage3 might stay without the velcro, but better safe than sorry.