I purchased
this netgear extender I know
this tp link will work as well. The one issue which I'm having with the netgear is sometimes when trying to connect to it I'll get a failed to obtain ip adress which the tp link reportedly doesn't have an issue with. I'd assume that other models should work as well being I'd assume the firmware etc are similar however I tried a cheaper
tp link that didn't work
I added it's mac adress to optimum although I'm pretty sure it's not necessary.
I set up the extender to connect to the strongest optimum network.
I connected my devices to the extender and the optimum sign in page came up in my browser.
Important note for some reason the mac adress of your device is recognized differently then when connecting this way vs straight to the optimum network. If you do auto sign in you'll need to do it twice and will be reconized as different devices.