Low Voltage tech here, telephone, computer networking and fire/burg alarms. I find most my work on 3rd party platforms, Field Nation for example is one of the largest 1099 markets to pair providers looking for technicians. Just be sure to screen the resources your looking for, because Field Nation doesn't really validate anyone's claim to skillsets.

I had the exact same experience.

Found companies that advertised residential networking and they were like, "Yeah, we do it as part of a new build with full automation."

Ended up having to do it myself.

Any decent size IT services (or Managed Services Provider) can or has someone's contact info on hand for this sort of thing. Security camera vendors also do it all the time, so they would likely be able to do it.

Don't be surprised though if there's a service call + $85-150/hr. for a single run. In OPs case, a MCOL area like the one we service should have been about 1/4-1/3 the total cost even for a professional low voltage shop.

Low voltage contractors are probably there, they are probably security or fire alarm guys who would be able to point you in the right direction most likely if they them self would not do it. The company I work for wouldnt have done a job like that unless it was a favor as we do large jobs but even if my boss was willing to do that for a premium price it wouldnt have been that much unless it was like a 2-3 hour drive each way.

out lv techs here are twice what an electrician costs.

Google “structured cabling”.