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Hi, I live in a 4-floor house (1 floor is the basement) 6 family members live here our internet is slow. Our modem is on the 1st floor and I also have a 3 piece Eero wifi pack. My current plan is up to 100mbps download, and 10 Mbps upload. After talking to a cox tech support they say that it supports 5-7 devices. I will list the devices that are connected down below if it matters.
Device rundown(I added everything that connects to the WiFi):
3 PS4 game consoles
1 Xbox One
2 Apple TVs
1 Smart TV
7 Computers(One streams music constantly because we have a radio station.)
3 apple watches
Really depends on how much bandwidth each device is using. But with constantly streaming music, playing games that's going to consume quite a bit of bandwidth. I would suggest better internet plan first. Your router seems to be quite capable. Not sure though.