Security System for Tenant

[Mike B.]

I have a tenant for my first rental property. We are still screening her, but it should be fine and I expect to have the lease signed soon.  

During the showing, my future tenant asked to have a security system installed before they move in. She wants a system with a video doorbell. I didn't realize the cost when I offered to pay for the equipment and installation. The tenant will just pay the monitoring fee. 

This is my only rental property. Should I just sign a 3-year contract for a security system and then add the cost into our rent? Or just buy equipment outright and then let the tenant pay for monitoring herself? What do most landlords do in this situation?