Nest Protect Adapter

While replacing a smoke detector with a new Nest Protect battery powered smoke detector I noticed that the holes in the mounting plate do not line up with the holes in the electrical box so I designed this adapter in Fusion 360. Holes 1 and 2 line up with the holes in the Nest mounting plate and holes 1 and 3 line up with the holes in the electrical box. This was designed for US electrical boxes with a distance of 3.28 inches (83.3mm) between holes. This might work for Canada and Mexico. I p