@GuilhermeSantos In Access Point mode Deco will keep Main Network and Guest Network. You can rollback to default Router mode after you run speed tests. The reason I ask you to switch Deco mesh to...

@Chrisg2003 There is one special case, but I'll need you to run test to check it. If you power off Lounge Deco unit that uses WiFi backhaul, will another Satellite Deco switch from Ethernet to WiFi...

@GuilhermeSantos You said you have provider's Router. In that case, you can configure Deco mesh to run in Access Point mode and see if speeds improved. See Switching a Deco to Access Point (AP) Mode

@cedcor You are making good upgrade choice. Deco X55 and X50 are models most likely to have this feature. By hardware specs they are very similar. Check price of those, if both models sold in your...

@cedcor It should. Do you have X55 set and can't find this option in Deco app or are you just considering which Deco model to buy that has this feature?

@ShaneZampire According to TP-Link documentation (which sometimes is not up to date) Deco XE75 Pro should support feature called IoT Network, which is exactly what you need: separate SSID running on...