Backbone should work. The issue that I've seen with these devices is that they are not compatible with phone cases and that's a major pain. I got a Gamesir X2 used from CeX and cut off the rubber padding on one of the sides to make it work with my Flip 5 (with case on).
I was just saying that SD is a better purchase for marginally more when compared to PS Portal - when you purchase the SD used. Also, it can do more stuff than just stream and play.