Backless Bench for Large Plaza

BEEK design in Belgium has put together a cool bench series. As far as I can tell the series is called ensemble. They are not as flexible as I would like but I think their arrangement offers a variety of seating and social options. The design would complement almost any large open plaza. They need to offer options for backs and armrest. If I used them, I keep thinking that I will need to have a least 50% of them meet ADA which could be a whole other post, but a reality designers must grapple with time and time again.