How to set up a WiFi hotspot?

Question

WiFi

Hello! The question arose: I live in a village where only MTS has a normal Internet through a USB 3G modem. I recently set up WiFi in the house (distribution goes from the laptop to the router), and the idea came up to organize a WiFi hotspot with a coverage of about 3-4 km. In this regard, several questions arise:
1. Are there WiFi hotspots where several USB 3G modems from MTS can work simultaneously?
2. Is it possible to set up such hotspots under Windows?
3. If anyone has already encountered the problem of organizing a hotspot - share your experience.
Thanks in advance.