You can but you might have stability issues if they're to close to each other.
Reason why is they're not a full mesh system with a router controlling them. So they just connect to the ssid. IF they're to close, they can end up connecting to each others ssid and not back to the routers.
house is three bedroom about 1500 sq ft I have a wifi camera on the outside wall of the kitchen which works but it has a poor wifi signal which I am trying to improve .
If there's any way to wire in the extender and use it in access point mode, it'd work better.
As well as if you switch to a full mesh system, hardwiring in the satellites would make a better performing and stable system.
1500sqft isn't that big but the walls are what are causing your issues. I'd investigate either putting in ethernet (if you don't have it) or using moca or powerline adapters.
ethernet over a coax line. Some homes powerline doesn't work very well. And if they don't have ethernet but do have coax ran throughout, they work well.
