Relevant Reddit thread:
https://www.reddit.com/r/emacs/comments/6lz3dt/noob_using_saveplace_only_for_certain_files/

On Sat, Jul 8, 2017 at 2:02 PM, Gary Cheng <garycheng12@gmail.com> wrote:

> In order to save point position for only certain files,
> `save-place-local-mode` is used on the desired file. However, point
> position is not restored on next emacs session, unless save-place-mode is
> enabled. Enabling save-place-mode means point position is enabled for all
> files, which is not desired.
>
> So save-place-local-mode is not serving its intended purpose and at the
> moment there doesn't seem to be a way to enable save-place only for desired
> files.
>