Linus Tech Tips did 8K/48Gb/s testing on a bunch of HDMI cables. The results can be found in an Excel spreadsheet on this page:
We told you we’d do it, and here it is! Testing a whackload of HDMI 2.1 and 2.0 cables to find out if you’ve been wasting your money on cables for no good reason. Data from tests is attached to this post. If you are an educator or otherwise have a legitimate reason for wanting to look at the .jso...
I am sure there will be follow up testing and reporting which they will provide in the upcoming years, but this information can help you figure out which cables can pass the test for full 8K support at this time.
Since you are going up a wall a relatively short distance, make sure you can swap the cables out in the future should/when they fail.
The MAIN feature of most 8K capable inputs is that they support 4K/120hz inputs, which is mostly useful for gaming. Kind of.