Backstory: Much like setting up a home theater room, wiring a smart home is not always straightforward. Some people will always pay for the convenience for someone to install smart home devices in their home.
The Idea: A smart home fix and install service.
Deep Dive: Since smart home devices are new, you would be able to charge a premium to install and fix any issues.
You could try to sell a maintenance (subscription) plan to customers who don't want to be bothered with fixing any problems.
Validation: High-end audio systems like Best Buy's Magnolia section still exist. To test out the viability you could post a simple craigslist ad and see if anyone bites.
Monetization: You would charge an hourly rate or fixed price per job.