You Do Need power plug adapter while traveling from Namibia to Peru.

Here is Why You Need An Adapter

The outlet and plug type used in Peru are A, B and C and in Namibia are D and M. This is how they look like.

Namibia

In Namibia, outlets of type D and M are in use.

Type D

Type M

Peru

In Peru, outlets of type A, B and C are in use.

Type A

Type B

Type C