You can embroider them into the lining of your clothing, or onto the exterior if its something you don't mind being seen. Some people write sigils, charms and such on paper or cloth and then sew them into the hems or seams of clothes that aren't meant to be washed (dry clean only for example).
Some traditions embroider protective symbols onto the inner clothing so that it lays against the skin.
Painted or carved into the bottoms of one's shoes. Or on the insole.
Engraved onto jewelry, or on the backside of jewelry if intended to be hidden or in contact with skin.
On ribbons, belts or cordiage that is worn.
Inside the lining of a purse, or tucked into a wallet.
Painted onto the nails. Written onto skin.
In homes, apotropoic symbols are typically found in rafters or above entryways like doors, windows, fireplaces, etc. Some put them behind mirrors or photos
Really, you can put them pretty much anywhere depending on their purpose.