Fastening a coat rack to a wall - no studs

First question is permanent mounting versus non-permanent. Permanent is always stronger, but is going to show wall damage if you change your mind. We went with single coat hooks near the door and I used stainless steel (no rust - stronger than aluminum) pop rivets and small screw head size washers. The rivets hold tighter to the wall than plastic wall anchors or molly bolts. And exterior walls often have foam insulation that prevents molly bolts from fully expanding. Always pre-drill for any permanent mount.

For non-permanent mount - yes I use Command tape. Make sure you prep the surface for longest life.