Best template method for Single Events in Child Theme

HI,

I am using events+ for listing events on http://unievents.simplecsr.com/

I am intending to use shortcodes to display the events on the existing http://unievents.simplecsr.com/static-events/ and http://unievents.simplecsr.com/past-events/

But for the single events page itself I am looking to create a custom template and would like to know the best method to do this in my child theme.

I was intending to do something similar to https://premium.wpmudev.org/forums/topic/events-template but I see the final message in that thread suggest there may be alternative approaches.

Can you please let me know if I need to add a whole folder or just a single file template to my child theme to get it to show in the template lists in the dropdown on the events settings section under Appearance.

Many thanks
Chris