How to install a parallel arm door closer.
The best way for residential home, as far as I have checked.
The other two methods are :
1. Regular [most power efficient]
2. Top Jab. [medium efficiency]
This is the least power efficient one. But what does power efficiency mean when door closers aren't powered by anything? Probably you will need a more powerful closer than usual. Not a bit problem for the benefits.
https://www.youtube.com/watch?v=w8Z8Rk4jQu0