Houstonians that recently bought a generator: Who did you have install your "transfer switch"? How much did it cost for parts/labor?

I hate posting questions like this, but I hate Nextdoor even more.

I just bought a 12000 Watt generator, and just wanted to know if anyone can suggest a reputable electrician to install a transfer switch to my home/circuit breaker. Preferably around heights/oak forest/garden oaks area.

How much did the installation and parts for the transfer switch run you?