PXE boot VM's on multiple networks.

Running VCenter Server 6.0. ESXi 5.1.

First off its been a while since I have posted here I apologize if this is in the wrong place.

I am researching using a pxe server for our vm's. In the link below it says the pxe boot server must be on the same network as the VM's network adapter.

VMware vSphere 5.1

We have about 5 different VLANS that we stand VM's up in. Do I really have to have a PXE server in each VLAN or is there another way I can serve new pxe boot VM's that will be on different VLANS and point them to a single PXE server?