What about a property in the Sounds?
Say so in the request. Water access changes both who can take the job and what it costs, and it is far better in the quote than discovered on the morning.
What does monitoring cost?
A monthly fee, and the number to ask about since it outlives the install many times over. Check the contract length too, because some are multi-year.
Can they take over my existing alarm?
Often yes, depending on the panel's age and brand. It is usually far cheaper than a new system, so ask before agreeing to replace everything.
Where should cameras go?
Entry points and approaches rather than pointed at the whole yard. A good installer will walk the property and say where coverage is genuinely useful rather than selling you a camera count.
Are there privacy rules?
Yes. Cameras that capture neighbouring property or a public footpath engage the Privacy Act, and an installer who raises it before you ask is one worth using.