Two handlebars on bicycle
From later comments - those loop-type attachments are only rated for attaching accessories like lights and so-forth.

These are NOT handlebars



They are intended to be used like this



If you want higher bars, then raise your bars with a higher stem.  The dirty-hack described in JonR's excellent answer remains a workaround at best.

Always consider how you're going to get to the brakes in an emergency.