on the head of ours, servitors —

on the head of ours, who fully exist for you —

having five heads —

 rāvaṇa, the leader of rākshasas, his —

(among all divine places) most special thiruvarangam —

beheading such persons —

they will roam around offering their heads for someone else to live, indulging in human sacrifice. —

 arriving during the sorrowful times —

competing with each other in reaching emperumān —

(emperumān) himself, who is the head of all celestial entities —

keeping the pots on top of the head and dancing in such a way that they come down spinning (from the sky) —

on my head, which is the top most limb, which is the apt target for them —

on my head —

atop my head —

have decorated my head; —

my head —

for my head —

 nārāyaṇa, my lord —

 my lord —

 are being set on my head —