@TP-Link  Thanks for your answer,

The tplink archer c60 can manage more than 50 clients without any instability?

I thought that using a deco as router would be more stable due it's cpu seems to be more powerful, isn't?

@GuilhermeJorge 

Option 1 will not work. For it to work, you must place Main Deco (you call it Router on your picture) between Server and Switch.

Main Deco in router mode plays the same role as Archer C60. 

@Alexandre. 

Hi Alexandre, thanks for your answer.

So, based on this topic 
 

https://community.tp-link.com/en/home/forum/topic/98898?page=1

i revised my topology an now i plan to wire as the image below, following the Ethernet Backhaul configuration 

Is this the best topology and configuration to ensure speed and stability?

Thanks in advance

@GuilhermeJorge 

This is good topology and it should work just fine. It should be stable.

Just one suggestion: depending on your Satellite Decos utilization, or you may wish to consider Deco M9 for Satellites with WiFi backhaul. That would require 4 of them. Unless you ran the numbers already and know M5 will work for you, then having Deco mesh with consistent hardware (all M5s) makes more sense.