You may have TONS of excuses why you don't need to pay your techs/installers OT. We've heard it all... but you still do need to pay it. This post outlines how and why to start tracking hours and paying OT correctly if your payroll isn't compliant.
Even as AI gets more advanced, it's still not reliable for Human Resources answers. This exchange with AI outlines a couple of the key flaws, and why you need to consult with a HUMAN for HR compliance questions.
The Big Picture Consulting is transitioning to My HR Guy! We're your entire team of HR experts, helping HR Guy to keep your business compliant and bring you peace of mind.
To be blunt: your technicians NEED to appropriately track their hours, no matter what type of compensation plan they're on. And your brand (and possibly your bottom line!) is at risk if they don't. This is one rule you need to strictly enforce...

We’re not a generic HR firm. We’re built for service companies with crews, callouts, overtime challenges, and fast-moving schedules. You get practical HR support that fits the real world, not corporate templates.
The HR Guy – HR Support for Service Businesses