Just a question regarding Deco's maximum connections.

I have a Deco network with 3 M9s and 3 M5s, the M9 being the main Deco. 

For example, the X95 promises up to 200 connected devices. If I change only the main Deco (M9) to an X95, will my network allow 200 devices? Or do I have to change all Decos to X95 to achieve the 200-device limit?