Router with multiple outgoing 3g how to do?

Question

network hardware

I need a wifi router that can plug 2-3 usb modems (3g / 4g) and that the router uses them simultaneously
for independent requests, something like load balancing for a bunch of small outgoing http requests.
I know that there are routers to which you can connect several 3g \ 4g modems and when one falls, the router starts using another, but I need everything to be used (for independent connections, of course)
Tell me how to solve this problem.

Answer 1

Buy multiple routers.