O2 my data spot to dsl. Where is APL?

Hello O2 Community,
I had to move places during the start of corona lockdown back in March 2020. In my building nobody could find the APL but there must surely be something somewhere. I had to do home-office at the time so I was in urgent need to get internet, so I got the O2 my home spot, which has not been great since my flat in the first floor is surrounded by buildings. 
Now that I have time I would like to get the DSL instead to get better internet for my home-office needs.

1. Can I change from the homespot contract to the DSL contract? Or to cancel it to not have a double contract?
2. I found some box in the “hinterhaus” building, I am in the “Vorderhaus” that might be the APL, since last time we couldn’t find it within the building, is this it?
 

Thanks for the help
-Maria

Moved to English DSL by o2_Ines.