I have the actiontec 1.1 moca adaptor connected to one of my minis that acts as the gateway to my router in my office. Works great with my roamio pro creating the moca network in another room. Just plugged the adaptor in and it worked fine with no setup required.
http://smile.amazon.com/dp/B008C1JC4...ing=UTF8&psc=1
Tivo seems to be selling their own branded model now. When I set up my moca network they were reselling the actiontec moca adapter.
Which router do you have? Is it really a current model? The most current models support multiple radios and antennas for better throughput and signal strength.
-David