You can always save them as favourites in Aurora and not install them. FDroid not sure if you can (I haven’t found a way to, but maybe installing then uninstalling saves them in your FDroid apps list? Obtainium you should be able to set the app up (i.e. add the repository, etc) then just not install it.
Best practice is not to install any unnecessary apps you don’t need or aren’t using.
P.S. Anything Unusual or non-mainstream I keep a spreadsheet with the app, source, URL, etc, for reference for future clean builds… Essentially a variant of my table in my first post here: