Threat tidy plates addONS

Hello there, I start playing tank recently and I like it but the problem is when I watch for example the Leader of <Titan> Shadowko live streaming , i saw him on the Lichking the boss has bigger and clean bar and names , so I searched about it in google and found out that there is an addon that let you customize the bar of the mobs and boss as tank , downloaded the addons , been 3 hours now with the help of chatgpt and still the addon not working properly and cant customize the BAR scale , also in these 3 hours tried too many method deleted some folders in WTF>ACCOUNT>name plates etc

Can any one help me? maybe give me better addon to install?
thank you