I would suggest going to the below website. It is an interactive map that shows the main campaign maps where everything is.
https://sniperelite4maps.de/It does not however show where everything is for the overwatch maps. I would suggest looking at the steam guides, i.e.
Railyard:
https://steamcommunity.com/sharedfiles/filedetails/?id=21452...Compound and Railyard:
https://steamcommunity.com/sharedfiles/filedetails/?id=24284...