^^not sure what you mean. I need more information
"Negative" angle is where the front of the keyboard is higher than the back. This is the opposite of where keyboard feet/risers normally come, but - depending on the size of your hands and the details of your setup - is arguably a better posture ergonomically, and is certainly kinder on your wrists. For built-in examples, see the Microsoft
4000 or
Sculpt. When people are writing about "tiliting" in addition to "tenting" with regard to their Ergodox, this is what they mean. ("Tenting" is the angle of the sides.)
Actually, all I really want is enough of a slope to counteract the HHKB's slightly agressive forward angle, and make it overall flat.
Failing this, I'll just order a normal wrist rest with no bottom panel.