Add content as soon starts

As every theme is different you can’t really expect a plugin to know where to put the slideshow in.

As you say the best place would be the content filter if that’s where you want it.
If you want it anywhere else you could inject it after using jquery?

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)