The code set that would probably have the most likely hood of working, is the Android TV code sets. Since all those boxes usually use a form of that. The remote looks similar to the Channel Master CM series, which are in the database.

I personally would not get the HDMI out version of the Tablo. One of the cool features about the Tablo is it can go anywhere in the home and it becomes an app on your existing systems. So no additional inputs are needed on equipment, no additional programming of the remote, no anything.
I've had my 4 tuner, 1TB for over 2 years now and it's great. I use it thru my Roku Ultra in my personal system. And have tested it thru many other devices.
One sad thing is they don't seem to offer a lifetime license anymore - glad I got mine when I did.