Is it possible to use two MI424WR routers on the same network?
It is, although unless your network has special requirements, it is not recommended to operate more than one router as a router. The other router should operate as a Switch/Access Point.
What are you looking to accomplish?
My wifi is not strong enough to access throughout the entire house. I happen to have an extra wifi router and figured if it would work I would not have to buy anything else.
You might try setting up as a bridge/repeater rather than another router so to avoid needing to do network address translation for the network behind the second router.
Have a look at this link - it may help.
I will give that a try. Thank You