The previous owner had put in a DIY alarm. The insurance company said we would not get a discount for having this unless it was covered by a maintenance contract. However they were happy to provide a quote based on us having no alarm and the extra we had to pay was negligible compared to the cost of taking out a maintenance contract.
My ADT contract, which includes maintenance, police notifications, and mobile response from a national name security company, costs about the tenth of what the typical motorist cheerfully pays each month on PCP for their car, and is a thousandth or less the value of the movable property in my garage and house. Its hardly Elkn Musk levels of cash.
You either care enough to secure it properly, and/or to insure insure it properly, or you dont.
The alternative whereby you try to save money in the short term and hope itll be alright but risk losing your anal virginity to the insurer if something does go wrong isn't a sensible approach.
You either cover your arse and accept the cost of doing so, or you dont cover your arse and accept instead you may well be royally stuffed when it goes sideways.
Theres no middle ground where it'll sort of be alright in all circumstances for little or no effort/money.