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For Couch/Bed work, I have a lapboard thing with a mouse pad. I have several devices that make this worthwhile.
This is what I have. It was a gift, and I didn't know I needed it. :D
I bought one of these from Amazon for my Area 51M and love it.
I also found this if anyone else is interested. https://www.amazon.com/gp/product/B00X6J1J6Q/ref=ox_sc_act_title_3?ie=UTF8&psc=1&smid=A2FFYH1WAKBFLO
its intended for 17" laptops and has a mouse pad.