I have never tried to install an automatic shutoff system, but it seems to me that there may not be enough space in the garage valve box to accommodate these devices. My water supply box is only about 9 inches wide and almost all of the space is used by the pipe elbows and the main shutoff valve. Even if you cut into the drywall, there is still not enough space because the pipes are under the concrete slab. I wouldn't want to install the device outside. My guess is that most people don't not go to the trouble and expense to install a shutoff device. That is why I suggest buying the inexpensive battery operated water alarms from Amazon. I agree that these will not prevent damage if you have a major pipe leak, but your homeowner's insurance will cover the damage. Snowbirds should close the main water valve when they leave town.
Perhaps someone can post a photo of a completed installation of a shutoff device and the cost (in dollars) to install it.
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