Background slideshow options

Hello,

I am looking for the best option for a background slideshow. I know that there are a few available, however I was looking for one which would allow me more control over the position, proportions, size and transitions.
What are the best options?
I have tried meta slider plugin but can’t see where this can be entered via the short code into the site to have it as a standard for every page.
Also background slider doesn’t give many options to manage the proportions or placement of the slideshow.

Any insights would be helpful.

Many thanks

anthonyod