It will not fit in the 200DLM/A housing, it could be used with the a7C II or a7CR cameras in the 200DL housing: www.ikelite.com/blogs/buying-guides/sony-a7c-ii-a7cr-dl-vs-dlm-ikelite-underwater-housing The 200DL housing also has the advantages of supporting the USB-C charging & data transfer bulkhead, use of the camera's EVF, and option to connect external HDMI monitors.
Sony 12-24 2.8 lens fits with this set up?
It will not fit in the 200DLM/A housing, it could be used with the a7C II or a7CR cameras in the 200DL housing: www.ikelite.com/blogs/buying-guides/sony-a7c-ii-a7cr-dl-vs-dlm-ikelite-underwater-housing
The 200DL housing also has the advantages of supporting the USB-C charging & data transfer bulkhead, use of the camera's EVF, and option to connect external HDMI monitors.