Yes.
Need the same passwords too.
Yes, that’s correct.
Most would but you should read the manual for your model because some of those devices can act as repeaters/signal boosters but you need to set them up that way. It sounds like you set it up as 3 separate instead of as one signal repeater. It may be as simple as giving them the same name and password, or you may need to log into each device and change the settings.
if the APs are spaced far enough from each other so that their signals don’t interfere with each other, you can keep the WIFI channel the same on each and move essentially seamlessly from from one to another.
Buy a mesh system... I recommend Eero... I’ve beta tested for them for years.
Don’t you save the login info?
I would recommend against naming different things with the exact same name and password.
Any of the Bush’s ever come around and say hello?
How big is your house?
Sounds like you are making things way too complex. Just go with one Router and put in a mesh hub like Orbi. It usually comes with some satellites, so put them elsewhere to ensure strong signal everywhere.
You want to setup two of them to *extend* the network. One network. One password.
https://lifehacker.com/how-to-extend-your-wi-fi-network-with-an-old-router-915783308
Although it may appear that it does since you would be using the same SSID, the wifi card in your devices are hanging on to the strongest signal until it loses it, then reconnect to the next strongest AP, causing a brief several second disruption in your network connection at best and a "split brain" situation where your adapter constantly switches between SSIDs since it cannot determine which one to stay connected to.
If you had a mesh wifi system (single router with mesh access points) then the wifi adapter in your devices is smart enough to connect preemptively to the nearest strong AP and transfer your connection to it without causing any network disruption. Routers are autonomous access points, meaning no mesh. There are many consumer and soho routers that support mesh APs, however you have to buy compatible mesh APs (almost always the same brand).
Use the same name and passwords. Put one on the lowest channel and the other things n the highest so the don’t fight each other for the channel