What are some red flags for grooming companies?

this is my first dog as an adult (I’m 36)

I am trying to find a good groomer in Houston, but they all kinda give me sketchy vibes. they all seem to also do boarding and I want to find a groomer that only does grooming.

also I don’t like how you gotta buy packages for services rather than just paying for what you want. is that the norm?

primarily I want to find a groomer that prioritizes what’s optimal for the dog. meaning don’t cut coats that shouldn’t be cut, don’t use perfumes, dont dye his hair weird colors, etc

can you guys give me some pointers?

thanks!