Appreciate the detailed answer.You're right, OpenWRT will not hide but let's say protect my home computers from being monitored.Also, VPN is a must and need to figure out the best way to handle that.I don't think they will forbid me to bring the Pi.
Noted, I plan to connect to my iSP using the USB port, and then the WiFi to distribute the internet at home on a local-based network.Found this video, seems quite straightforward: NetworkChuck - RaspberryPi router
Depends on the hardware... Copy machine is forbidden for example.