long range remote for android boxes

[Bk456]

I want to run my fire tv 4k through a hdmi matrix but its not got infrared so remote won't work. I want to buy one of those keyboard remotes anyway and i know some of them are long range but i also know a lot of them are rubbish..

Can anyone advise on one. Im not too sure if bluetooth or RF would have longer range, i presume fire tv has bluetooth as i think thats how original remote connects...

 

[wiz569]

The Rii i8 wireless keyboard works from the other room through a block wall in my house,if thats any help