Those would work, but I bet you'd find a whole bunch of people on every single channel. You should look for walkie talkies that have privacy codes. There's still a chance of someone using your privacy code, but because there's more combinations of channels x privacy code, it's a smaller chance for people to be on your chat.

example: https://www.amazon.com/Motorola-T260TP-Talkabout-Radio-Pack/dp/B01DM7AEYE