One thing I always remembered about my cut ins from a hair replacement salon was the amount of overlap they'd have on my haircut. I'd ask them to cut it shorter and they'd refuse.

Then when I started to do it myself, I would get it cut so short, it was amazing!

My recommendation is to just go to a regular salon or barber and explain your situation. They will be able to cut it the way you want. Most hair replacement salon workers have no clue how to do a haircut other than beauty school basics they learned.