I need advice, please

I’m new to this and i need advice,

This is my situation. I’m trying to setup a hotspot for a campground radius around 3 km. I was thinking to get RB433AH with three R52N (so I’m covered for N wireless because of new laptops) and either three sector antennas or three good (19 dbi or so) panel antennas. Would three R52N interfere within if they are running all the same frequency or I have to choose different frequency for each of them? What would be the best gap between frequency if they have to be different. Would this work? Does someone have a better suggestion?

Keep in mind that I might later expend this to the nearest village (around 5 km ) so I will need repetition function as well,

Thanks to all of you who will help my with this.