The market offers a variety of smart lock solutions, all acting as replacements for your customer's current deadbolts. Haven sidesteps this design with its Smart Lock, a wedge one installs at the base of the door, inside the house.
According to the company this design is actually more secure than a deadbolt replacement, as it is anchored at the base of the door, the strongest point of the entryway. With steel, glass-reinforced nylon and aluminium construction, it promises to not only keep doors shut but also be lock pick-proof and strong enough to withstand even the force of a battering ram.
Installation appears simple enough-- measure the door for proper mounting, drill one hole in line with the included template and install via two mounting brackets.