If you are serious about your Android TV, you might want to consider the Nvidia Shield Pro. It is pricy, but for a good reason. Most of the cheap boxes out there have a download limit for some reason, especially when you use VPN, all the boxed I purchased and returned could not pull more than 17 to 19 mbps.
So after several months of trial, error and Amazon returns, I stood a chance on the Nvidia. and about 15 minutes after receiving it, it was up and running and zero limit on download bandwidth. It will take anything you throw at it, feel like a real TV device. But it costs $199.
I hope this is helpful…