WHERE TO INSTALL OMAMORI?
There is no "rule" to where to install your Omamori. The Omamori not only carries a blessing, it also carries the presence of the deity who created this blessing and protection. Think of the Omamori as a person, a protector... a gardian angel! You don't need to do any special ritual or take any specific care. Respect it and treat it well, like it was a good friend!
If you can, keep it close to you, close to your heart! People often put them in their wallet or tie them up to their mobile phone but feel free to have it wherever you feel comfortable with! Traffic Safety Omamori are often used in cars but they can also protect you on your bicycle or a stroller!
Here are some common examples: