My best result so far when testing Haiku on direct hardware is the Terra Mobile 1515. Sound works, network and Wi-Fi work, Haiku starts without problems, and runs at a good resolution.
So far, I’ve only tested it via USB, not installed, so I don’t know if it has an SSD or an unsupported eMMC (but I’m guessing it’s an SSD).
I need to test it more thoroughly. Also the integrated drive.
Terra is a German manufacturer; I don’t know if it’s available elsewhere.