Can't launch SuperSU on Amazon Fire Tv

Hey, just wondering if anyone can help, for the past week I've been trying to fix a problem with my Fire tv and have tried various methods to fix this issue. Basically I use Sloane 5.0.5 r4 ROM on my aftv 2, it comes with super su and the root does work as superuser requests pop up to allow or deny. However super su doesn't appear in apps (the GUI management tool) when installed (tried various versions of supersu from 2.4 to 2.7) and I try to launch it, it just takes me back to the home screen. From googling I can see a few others have a similar problem, some people suggesting kingroot(not keen to use that as it doesn't give me the same options as super su) some suggesting rbox will make an update to sort the problem. Although not something I know is definite. The super su works and it's binaries as suggested earlier but the gui tool is nowhere to be seen. Even tried changing sloanes rom and replacing it with another supersu version but this hasn't worked. Just to add more details im running TWRP recovery also!

Thanks.

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