Элтекс

I have more than 35 devices connected to my Netgear Nighthawk router, which is rated for 20. Most of them are low-bandwidth devices like cameras or printers from Amazon. The router may elect to renew the leases when I experience intermittent TV buffering. Do I need to attempt adding a router? They want to be on the same network for configuration, so I'd prefer not to do that. The plugs are necessary since the TVs have firesticks and recast that all want to be on the same network as the echo devices.