Worst case scenario, if I'm feeling like I need a little extra lap stability, I may up getting this little 13x13 lapboard off of Amazon:

Grifiti Deck 13 Lap Desk for MacBook Air, MacBook Pro, Notebooks, iPads, Small Keyboards, and Writing https://www.amazon.com/dp/B004SOMAWA/ref=cm_sw_r_cp_apa_i_7tmaCbBPG28RJ