@Br3nda Iʼve spent a lot of time figuring out these things. Youʼre totally right, and sadly the majority of peripherals (at least for me) are ill-suited to the task.
Keyboards should be no wider than 40 cm wide, for starters. Maybe 41 cm, tops. But the standard keyboard has a right-handed person reaching too far to the right for the mouse.
@jackyan I need the number pad so I have this Bluetooth one