Uhm no, you just roll your skill, in this case presence seems appropriate, and if you beat the target roll set by the GM, the aspect is created. There is nothing more to it, no +2 for a zone or for additional tags, the rules don't allow for that. Maneuvers are always done the same, there are no "zone maneuvers", the target for the maneuver is the zone, so if you are successful the zone will have the aspect. Or the scene, if the scene was your target. Or the tree, or your ally, or your opponent.
If the maneuver targets an enemy, or there is a justification to resist against the maneuver, you roll against another roll, instead of a fixed number. In your case, trying to inspire your allies, the opponent could defend against you placing the aspect by rolling intimidate against it, and if he is successful, the aspect will not be placed. If you tie, the aspect is fragile, as usual.
Target numbers for aspects are pretty much what you can agree on as a group. I usually go for a default of 3 and then adjust by how cool or how appropriate the aspect in question is. Or in some cases, I take a previous skill roll as a basis. If your opponent did an intimidate aspect before your turn, for example, and you wanted to remove that aspect.