I teach first grade. We don't have 1x1 iPads yet, so I'm not sure how to help you on that. However, I got rid of desks several years ago and my kids use tables as well as the floor. Every child has a white board that is big enough to use for a lap desk so it's up to them as to where they sit. I have two tables that fit 7, one table that fits 5 and a coffee table (which they love and hope to get more). They can sit at the tables or on the floor. I don't have a couch but I have several bean bags and large floor pillows that they also use. I teach them from the beginning that recess is play time but when we're in the classroom we're here to help each other become our best "selves". They choose where they work and I encourage them to help each other by not disturbing each other and choosing to sit near people that will only help them. I really play up that they're old enough to make these good choices now and that they need to show me that I am making good choices in letting them be independent with this. I have had to help certain children from time to time by assigning them a workspace though. Try it, you'll really see a difference in student engagement!