Array might work. The American Heritage Dictionary Fifth Edition defines it as meaning:
- An impressively large number, as of persons or objects: an array of heavily armed troops; an array of spare parts.
It is is true that it refers mostly to placing the machines in a particular position, but it can be used in other situations. Consider the title of this October 13th 2013 worldhighwaysexample appearing on macmillandictionary.com article as an example:
Caterpillar has developed an array of machines for China that will be built in China.An array of solar panels supplies the site with electricity.