@stavrov I would suggest you test these Tp-link adapters with Deco first. Unplug security camera and plug Deco. If Deco do work with these adapters and WiFi speed is acceptable, just get inexpensive...

@itm60 Seamless roaming between access points when moving around the house Any WiFi mesh should offer that. It is the principal difference between WiFi mesh and bunch of independent WiFi Access...

@stavrov Have you bought powerline adapters already? If not, TP-Link has adapters with two Ethernet ports, you could try those: "TP-Link AV2000 Powerline Adapter (TL-PA9020P KIT) - 2 Gigabit Ports."

@stavrov I like your plan with powerline adapters, so I'll wait till you put them in place and see the result, before discussing other options. If 2nd floor Deco can use powerline adapter to...

@Renard I may be able to help with improvements to your home network and WiFi, but this may not be the fast process. I will need to ask questions, follow-up questions, to get information from your...

@stavrov Powerline adapters is an option, but you will need three adapters: two for Deco that are not wired, and one for Ethernet wired Satellite Deco, so that all three will establish wired link to...