Do I need to let my wife's BOI company handle my NON-O dependent visa application?

Hi there,

I just got married to my French wife, who is here on a work NON-B BOI visa i.e. works for a BOI company.

I want to apply for a NON-O (dependent visa). The company she works for tells me that I cannot apply for it myself and they need to do the procedure themselves as they are BOI, and charge me THB 10K for it.

Is this correct that they need to do the procedure themselves on the BOI portal, hence I cannot take care of it myself?

Does the cost seem right?

Thanks in advance