I have the Amiko A6 box has plex on it which I use and is good the mytv app is really simple to navigate and ease of use can change skin ect I have a 256 USB for recording possibly go higher don't think you can buy a freeview dongle for it like you can on the z8 which would use the mytvonline app maybe email Amiko with your questions but I'm sure
@AmikoUK would be able to say more it does have updates ect but the formuler only run a low end android system.
There is no lnb on the Amiko A6 and never heard or seen anyone with freesat on the A6.
As for formuler I would go with the z8 or the z8 pro the mytvonline app is brilliant and nice user interfaces again you can buy a seperate USB freeview tuner to use via mytvonle app and would use the mytvonline app for freeview