How accurate is the location of a device in Find My?
How accurate is the located device or person to the position in the map?
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It depends upon what is being used to determine its location. The chances of locating a device depend upon which features you selected in:
Set up Find My on your iPhone, Mac, and other devices - Set up Find My on your iPhone, iPad, iPod touch, or Mac - Apple Support
GPS signals can vary. If I am at home and I am using GPS, it usually has a circle around where my phone is located but I can't tell if it is in the house or in the garage. GPS signals can also be very poor and then you're lucky if it can tell within a mile or two.