Wyze Floodlight Base Diameter?

Does anyone know what the Wyze Floodlight Base Diameter is or the dimensions of the base plate?

About 5". Doesn’t fit a normal 4" round junction box and no adapter plate is included, unlike the Nest thermostat. Just discovered this today when trying to install the floodlight. Not sure what to do.

I wonder if this is what is needed or if this will work for mounting this floodlight on vinyl siding?

Builders Edge 130110006001 Octagon Mounting Block, W X 6-7/10 in H, White

The dimensions look big enough but you still need some way to fasten the central floodlight screw to the wall. I think you might be able to make it work.