The current Shield Pro, which you already have.
It lacks HDR10+ and HLG, but supports HDR10 and Dolby Vision.
It, and the Xbox, are the only off the shelf streaming devices that passthrough TrueHD. I do not know what HDR formats the Xbox supports.
There might be an uber-audiophile $1000 Android TV device somewhere, but I’ve not aware of such (out of my price range, so I haven’t looked).
The other option would be to try Plex HTPC or Plex Desktop on a Windows PC (Macs, like the ATV, block TrueHD, unsure about Linux). They passthrough TrueHD Atmos, etc audio and support HDR10. No idea if they handle DV, HDR10+, etc. You can download both from plex.tv.
Both use mpv.io as their video player. Here’s a thread that may have more info.
[HDR Metadata Passthrough] - Plex HTPC for Windows
