Can I reap the rewards if I don't stake $MECH tokens to my Mechas?

Definitely. With the default speed of Mecha, you can get TWO "Profile Lv1" and ONE "Profile Lv2" rewards if you enter Light Holders.

Nonetheless, you can get FIVE "Profile Lv1", THREE "Profile Lv2", TWO "Profile Lv3", and ONE "Profile Lv4" rewards if you enter Strong Holders