I would share your concerns.
The device is very popular here in the US, and is often pushed / installed by the dealers.
Part of their policy is to never tell anyone, even the owner, where the device gets installed.
Can you work it out with your insurance so that your dealer (or whoever works on your Maser on a regular basis) is the one to install it?
If not I'd probably let them do the other 4 cars and take the discount there.
The device is very popular here in the US, and is often pushed / installed by the dealers.
Part of their policy is to never tell anyone, even the owner, where the device gets installed.
Can you work it out with your insurance so that your dealer (or whoever works on your Maser on a regular basis) is the one to install it?
If not I'd probably let them do the other 4 cars and take the discount there.