Perixx appears once on this site, in ergonomic keyboards, with its Periboard-512 split keyboard.
A fixed split. A full-size split keyboard with a fixed 3D shape and an integrated wrist rest. Nothing adjusts — no keyboard in the hub offers adjustable tenting, and the only adjustable angle is the Logitech K860’s negative tilt — but for a first move away from a flat, straight keyboard, the split already changes the position of the hands and arms. Trying a split keyboard for the first time covers the first weeks.
A size you can measure. 485 × 236 × 44 mm (19.1 × 9.3 × 1.7 in) — the only keyboard in the hub to publish one. That width, with the number pad, decides how far the mouse sits from your body, so measure it against your desk.
The details. A 1.8 m (5.9 ft) USB cable, seven multimedia keys, and tactile keys Perixx says need less pressure per keystroke. The listing also recommends it to reduce RSI pain; that is a medical claim this site does not repeat.
Check the layout. The listing we read is British QWERTY: the letters match a US keyboard, but Enter, @, ” and a few symbols move. The same reference is listed on Amazon.com, so check the layout on that page — do ergonomic keyboards work with a Mac? covers what a regional layout changes.