Question about Dev fees

I am a newbie here so please forgive me. I have a few questions about the dev fee that I haven’t found anywhere else.

I installed the L3+ firmware on a few rigs. I am ready to flash my entire farm but I want to have a few questions about the dev fee answered first.

Is the dev fee only applied when using one of the HiveOS pools?
Is there a way to pay per rig I use instead of paying for the dev fee like a toggle switch in the firmware somewhere? I am more than happy to pay per rig if that is an option rather than paying the 2ish%.
Is the dev fee automatically enabled?
If yes, how can I see what exactly the rigs are doing?

If I missed a tab somewhere on my account and this is a silly question, please direct me there! :slight_smile:

Thank you so much