Yep, put them up in airspace with a higher concentration of manned aircraft and see how well that floats with Air Transport and General Aviation. This bull dozing of small business and recreational flying is not cricket as my friends across the pond would say.
Heck, they won't the air space between 200-400 all to themselves.
The company’s aeronautics experts propose that a 200ft slab of air – located between 200ft and 400ft from the ground – should be segregated and reserved for state-of-the-art drones equipped with sophisticated communications and sensing equipment and flying at high speeds of 60 knots or more.

Amazon proposes drones-only airspace to facilitate high-speed delivery
The retail giant’s proposal carves out airspace from 200ft-400ft exclusively for autonomous drones, with a further 100ft above it declared a no-fly zone
