Uvserse Install without modem/router

I have to cancel my internet and home phone and will only have uvsere tv from att as their internet speed in my area is crappy. I have had to order another internet service from xfinity.

I was told I need to return the modem/router to att.

How will my tv's work now, some of my tv uverse boxes are wireless and require the wireless att access point for boxes? I have not been able to get any help from att and I want to make sure all of my tvs will still work as I do not have cables installed in the wall to connect most of the boxes, also will the DVR still work.... zero help from att.

QUESTION!