You have a bypass chlorinator. Not an inline then. I'd go with an inline.
Less hoses and junk to worry about. In the steps is an original idea.
I have steps too, but no where in them to put tablets. Guess I could tie them to a post and put them in some stockings. We'll see.

Hey maybe a piece of 4" pvc glued inline with a cleanout cap on top. Hmmmm....