DRV's are not normally positioned directly @ pump (circulator) discharge.
No, they're piped up separately. There's no reason why they couldn't be connected directly to the pump outlet, if the FMD was located elsewhere to allow the turbulence in the pump discharge to settle.
So, what is the point of your post? Is there any practical difference between a regulating valve on the pump discharge and a regulating valve separated from the pump by a couple of metres of pipe?
PS whilst this is of interest to a few, it has got a long way from the OP's question, to which the answer relates to his misunderstanding of the purpose of balancing.