The Apex 350, Apex 3, Apex 3 TKL, and Apex 5 have 24 anti-ghosted keys:
1 2 3 4 Q W E R A S D F, Left Shift, Left CTRL, Spacebar, Tab, and the 4 arrows.
If you to learn more about what kinds of anti-ghosting tech we use and want to stop letting your teammates down with keystroke misses, check out our boards HERE!