WoW
The twelve side buttons map to WoW Action Bar 1: keys 1 through 0, minus, and equals. The Scimitar ships with that default side map; program the same grid on the M913 in Redragon's dual-mode Windows software. Put your rotation on the row your thumb rests on, then stack cooldowns and defensives on Shift or Ctrl hotbars.
If the far row sits outside your grip, the Scimitar's Key Slider moves the whole panel 8 mm. One r/wow thread describes room for the buttons to move until the thumb rests on the #5 key. The M913 uses the same grid in a fixed position, so plan binds around whichever row your thumb naturally hits. Reddit durability talk contrasts long Scimitar skate feel with buying an M913 to replace when wear shows up; several WoW threads also warn that Corsair iCUE can feel less trustworthy than SteelSeries GG, so export your profile and save it to one of the Scimitar's three onboard profiles before you rely on it in raid.
Blizzard's input-broadcasting rules mean one press should trigger one action, so avoid macros that fire multiple casts. Follow the WoW MMO mouse setup guide for the mapping walkthrough and see the WoW setup hub for wider desk context.
FFXIV
Map a twelve-slot hotbar 1:1 to the side grid. Shift and Ctrl hotbars stack the same way; the Key Slider helps when far rows miss, but only if the fixed grid is the problem.