You can try to ask the installation guy to see if he is willing to help.
But it is quite simple to set it up by yourself.
My wireless settings for your reference.
You may want to change 5GHz band and 6GHz band Channel Selection to "Auto". I use a specific channel based on my situation. I like to use CH60 (DFS) channel for the 5GHz band. For 6GHz band, I actually have not tried to see if the channel selection makes a difference or not.
I decided to disable Band Steering in my case --> if not somehow my laptop with Intel AX201 WiFI 6 adapter often connects to the 2.4GHz band.
Enable 160MHz channel bandwidth do not affect other devices not on wifi 6 or 7, since it will drop to lower channel bandwidth automatically. However, if you encounter issues, you may have to use Guest Network with legacy WiFi 4 and WiFi 5 clients. It is usually not related to the 160MHz channel bandwidth, but rather because of the "Mode" settings. Some legacy clients do not work when AX or BE mode are used.
Some experts prefer to use 80MHz channel bandwidth for 5GHz band to avoid interferences from neighbours. In the enterprise 40MHz channel bandwidth may be used (slower speed but better reliability).
Similarly I enable 320MHz channel bandwidth for the 6GHz band to achive higher SpeedTest numbers (not very useful in practice, just for fun) but some experts prefer to set it as 160MHz because it is not easy to achieve 320MHz channel bandwidth in Singapore other than at close distance, since 6GHz-2 band is not approved yet for WiFi use in SIngapore.