If I buy multiple locks are they keyed alike?

These are master lock brand...so if you take the puck into any locksmith shop they'll be able to key them all alike for a reasonable price. $20 a piece or less. (I'm a locksmith myself F.Y.I.)

Can carriage bolts be hidden? If used on shed doors, wouldn’t thieves be able to remove bolts/unscrew the whole plate from the doors?

Carriage bolts would go through the six holes you see in the plates in the picture. To get the mechanism off, thieves would have to grind the heads off of the carriage bolts. At that point the whole lock system would be easy to pry off. You could use construction adhesive or something of the sort on the back of the plates when you mount them to make them harder to remove. If it's a metal shed, you could weld the plates directly to the outside of the building. That would take this system to the next level. If you're so inclined, you could also weld the carriage bolts to the metal plates when you're installing it. Regardless, carriage bolts alone will result in grinding being necessary to get past this lock.

ASIN	B002DY7DRY
Additional Features	Key Lock
Brand	Master Lock
Brand Name	Master Lock
Color	Silver
Control Method	App
Controller Type	Hand Control
Customer Reviews	4.7 out of 5 stars 1,638 Reviews
Finish Types	Plated
Global Trade Identification Number	00071649236365
Included Components	Padlock
Item Dimensions	48 x 254 x 122 millimeters
Item Type Name	Lock and Hasp
Item dimensions L x W x H	48 x 254 x 122 millimeters
Lock Type	Key
Lock type	Key
Manufacturer	Master Lock
Material	Zinc Alloy Steel
Material Type	Zinc Alloy Steel
Model Number	M736XKADCCSEN
Recommended Uses For Product	Gate
Recommended uses for product	Gate
Shape	Rectangular
Special features	Key Lock
Style Name	Lock
UPC	071649236365
Unit Count	1 Count

Master Lock M736XKADCCSEN Hidden Shackle Lock with Hasp, Silver, Units

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