Root with Magisk

Click Install under the Magisk submenu on the right.
Will need an airmouse or USB PC mouse.
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Choose 'Select and Patch a File'
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Now browse to the boot.img and select it.
Now click 'Let's Go'
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A patched boot.img will be generated in the Internal_Storage_Downloads folder.

Go to About
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Click 7 times on 'Build'
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A new 'Developer Options' menu will appear.
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Go to 'Select Image to flash'
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Select the patched boot.img in the Downloads folder
Try to remove any USB storages so that unnessasary images from them don't appear in this menu.
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Select the 'boot' partition
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Now reboot and your device will be rooted.

Link to boot image that can be copied to device and patched with Magisk
https://mega.nz/file/Q6x01IiZ#otwu3fC710ssHfXlqapA1PtnF9bK_Bx6r2jhex8OYRw

Magisk app can be downloaded from Unlinked App Store in AndroidTV firmware v1.4 - Code StationPC
or here
https://raw.githubusercontent.com/topjohnwu/magisk-files/canary/app-debug.apk

Inside Magisk Settings you can enable
Zygisk and DenyList to add apps to block root from eg. streaming apps while other apps can still use root correctly.

To pass Safetynet, you can use Universal Safetynet Fix and install it as a module.
More info here
https://github.com/kdrag0n/safetynet-fix/releases