Keyless/smart lock for rental property to save on costs

[Kevin Lanphear]

Hello for my first three rental properties do I go ahead and invest into a keyless/smart door lock for the back and front doors for tenants?

We would switch out the door locks each time at tenant moves out and a new tenant signs a lease so that would cost a lot down the road vs buying a smart lock to save on costs.

What are your thoughts and what do i buy?