Using the Diablos NPC toolgun
NPC Placer

You are able to use the Diablos NPC toolgun. This toolgun is available for The Perfect Delivery System, The Perfect Citybus System and The Perfect Animal System.
With this toolgun, you will be able to create the NPC you need for your addons as well as placing a custom zone (for vehicle/animal spawn) unique to every NPC.

Create

First select the addon you want to interact with to create your NPC/zone.

Then, you are able to create a NPC or a vehicle place, also called a zone.
NPC
To create a NPC, press a left click. The NPC will spawn in the floor you hit using your toolgun.

As an admin, you can change the NPC position/angle when you want by taking it with your physics gun.
Zone
When creating a zone, first you need to hit the NPC using your toolgun. A zone is parented to a specific NPC, that's why you need to that.

You can now move where you want to place the zone. When the zone is in a good place for you, hit the floor.

The zone is now created! You can't change the zone position/angle. However, you can create a new zone again, which will replace the old one, as there is one zone per NPC!

You are done! I hope you like this new toolgun!