Hello. I am running LNM with MSFS2020 and it works fine.
Actually LNM makes its own database scanning the Community and the Official/OneStore folders, with the possibility to exclude some custom paths.
The app MSFS Addon Linker gives us the opportunity to have tons of extra airports installed, but not active in the Community folder, and every time we add extra airports (sometimes missing from MSFS) we have to activate ALL the airports to let LNM create the database with the full list.
As we can add "exclude" paths, It should be a good feature to let us add extra folders/subfolders to be scanned for extra airports without the need to have them in the Community folder.