I got the https://www.amazon.com/gp/product/B01MR90E3A and it works!
Here is my 5 cents. I tried this extender and it works very well!
1) It is working in repeating mode and suppose to drop speed by half, like any typical router, but it does not! Speed remains the same, I would connect to hot spot or I connect to extender.
2) I also noticed one thing. After white-listing Mac address of extender and connecting to it from your desktop you are redirected to optimum.net to register a device. Here is important to do whitelisting desktops in browser of
mobile mode, it should not ask mac and should register your device as Iphone. Only in this scenario I have a stable internet on my desktop, otherwise I had reconnection problems each time.
Cheers!