Is there a rule that Support always have to go bot lane to sup Marksman ?

Title. I find that supporting top laner is much more efficient than supp bot lane in marksman vs marksman battle of attrition. As support I want to do as many hits in shortest possible time to upgrade Frost Fang, which top lane vs melee is much better to do than bot lane. As Zilean i give my passive Xp to team mate, so technically we don't lose Xp in 2v1 top lane. It's kinda meta breaking, so is there any official rule that i can't go sup top lane , as some people call it "trolling" and "report troll" ?
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