OP is interested in how to secure the rack top mount. The single brake mount work but for light duty..... emphasizing very light duty. Mounting to the stays with the clamps have been mentioned and greatly improve sturdiness. OP also doesn't want the seat post mount but these versions work well. I've had the Axiom type and used their model rack with tubular rod (not the flat steel twisted stock like Blackburn). They take a serious load.