We will provide you with a wireless access point (the Unifi Pro) during installation but if you've got a different setup that you like or prefer – you are welcome to use it with our service.
You can add an additional router or wireless device to your internal setup one of two ways - you can either connect your additional device to the Unifi Pro via Ethernet (run a patch cable from the "secondary" port on the underside of the Unifi to the LAN port of your new device) or you can remove the Unifi Pro from the setup completely and plug your other device into Ethernet in its place. Either way, our service should essentially work the same way.
Just keep in mind, if you do decide to use the Unifi Pro in addition to another device, you will need to set your 2nd router into "bridge mode" in the configuration settings in order for the setup to work properly. Having two devices that are both trying to act as the primary router can create issues with your connection.