Knock outs can get close to 7 foot tall and they likely will get pretty big for that location.
They are not supposed to have problems of the other roses.
I would say they need time to adjust to being transplanted before they flower properly.
Might hit them with a rose food.
Personally, I do not plant flowers near pools unless someone ask for something that blooms and attracts bees.
I would pull them and give them to another good client.