Sorry, not trying to offend anyone.
The tab goes underneath.
Maybe someone had yours out of the box,substance abuse in the workplace, who knows ?
Page 32 and 33 of the owners manual (Pg 17 on a double sided PDF view) show it very clearly : http://www.horizonhobby.com/ProdInfo/Files/SRLR.pdf
Trying to put it under that piece makes it impossible to secure the two top/rear mounts without pulling the canopy 's nose up higher than intended, material at the tab,canopy junction would have to be cut away, etc.
Doug