@Gwido 

Hi，
It's too early to tell if adding Deco nodes will solve your problem, in your case, you can refer to the instructions below to troubleshoot.
What should I do if my Tapo smart device keeps losing connection or going offline?
 

If the problem remains, please confirm:
1. The troubleshooting you did and the test results.
2. How many Tapo cameras do you have? When they are working, please go to its Device Settings>Device Info page, and tap the Wi-Fi icon to see the RSSI value.
3. Please describe your network diagram in detail.
4. When the camera shows offline, what's the LED status on it? Can you control it if your phone is connected to the same router's Wi-Fi?

Best Regards

  @Gwido 

Hi, 
Thank you for your sharing. 
Generally, the different Deco models can work together. In your situation, it's suggested to start a new thread here for further assistance about the Deco product.
Best Regards