You're right! We, our, etc. are all first person and although most grammar sites recommend against mixing POV's, it's common in business content to use your company name throughout your text (to increase name recognition and comprehension) and follow the company name with pronouns such as we and our. For example:
"ABC Thingamajigs manufactures high-quality thingamajigs and whatsits. Depend on us for precision work in thingamajig manufacture."
Overall, I would say that when a business has more than one employee, that's the route to travel. However, if you are a single person doing business, I think third-person (although I have done it both ways) is a little too narcissistic.
What is most important is that, whatever POV you use in your content, you keep aware of the fact that your content is being read by a potential customer and you work to make them understand that there is a person on the other end of the keyboard that is helping them and not just blowing smoke.