Yes, if you are very careful and know exactly what you are doing – routers are dangerous. The IndoorHub is a simple, meshing indoor access point with no routing at all – it is designed to just plug in and go. The other big advantage is that the IndoorHub is a meshing Hub you can use additional IndoorHubs to extend your WiFi inside large buildings.
To use a router as an access point, you have to either (1) turn the routing function of the router off (put it into “bridge” or “AP” mode – some modern routers have that, but most do not) or (2) make sure you configure that second router to have a DIFFERENT IP subnet from your main router. For instance, if your main router is creating the subnet 192.168.1.x for you, you’ll want to configure the second router to use 192.168.2.x (or any other valid private subnet besides 192.168.1.x). If this makes perfect sense to you, you’re probably able to go along just fine. If you are foggy in any way, you might want to review our blog posts about how to use routers, because misconfiguring that router can BREAK YOUR NETWORK and we usually CANNOT help you.
If you set up your second router and your AyrMesh devices start to fail (and it may take days for it to fail), disconnect the router and see if the network starts working again (you may need to reboot your primary router). If it does, then the problem is with the configuration of the secondary router.