Again, thanks BK :-)
You raise an important point that our design and engineering team is actively working on.
We are recommending that a customer engage a suitably qualified Fire Engineer (or we can supply one) to assist with defining the placement sites for the units. An experienced forest fire person will be able to predict the likely approach paths of wildfires quite accurately. We are not expecting to need a complete "line" of units: in most cases probably a semi-circle of units covering the most likely approach path will massively reduce the risk of structure loss.
What is not mentioned on the website is that each device is equipped with an ultrasonic "obstruction sensor" (basically similar to the reversing sensor some cars have). Its original purpose was to sound an alarm to scare off beasties who have decided to use the system as a convenient scratching post, and vandals who want to use it for target practice... But there is an idea to use this sensor to modify the spraying pattern to avoid trees and bushes.
The 30 meters comes from the range of the spray heads we are using. We could increase this range, but that would involve upgrading several internal components and may not be cost-effective.
If you care to PM me your contact details, I can get Our Man in Canada on the phone to you: he's as old and grumpy as you and I, and it sounds like we would benefit from your input
