WIFI Booster/Extender

Ubiquiti is the answer you seek
Belle-Tech can install it.

I just installed a TP link Deco X20 system in my house. I have a 400 mbps speed from my cable company. The TP Link, Netgear, EERO, will all handle the AT&T Gigabit service. So will most all modern routers. I was using a Netgear Nighthawk R8000, and an R7000 as an access point. It worked well, but the R7000 was getting old, thus the new Wifi 6 system.

What you will need to maintain your speed with hardwired gear is a gigabit ethernet switch. You need this because the Mesh units usually only have a couple ethernet ports. Something like this:

Netgear 8 Port Switch

You can view larger switches, if you have more devices to connect than an 8 port switch would allow. Also, if you chose to go this route and you have been thinking about security cameras, you might want to consider a POE (Power over ethernet) switch. Depends o what cameras you might choose, plus you may have other devices that would need power supplied from the switch. POE switches are more expensive!

Once you have selected the mesh system you want to go with it is pretty much plug and play with all the devices. You will configure your mesh satellites via an app with your cell phone.

This is the Orbi system I installed for my sister:

Netgear Orbi Whole Home Tri-band WiFi 6 System

It will handle your AT&T 1000 speeds.

Here is the TP Link unit I installed for my daughter. It to will handle the AT&T 1000 speeds. It is not a WiFi 6 system.

TP-Link Deco Mesh WiFi System (Deco M5)

This is the TP-Link system I just installed to replace my old Nighthawk routers:

TP-Link Deco WiFi 6 Mesh System (Dexco X20)

It to will handle your AT&T 1000 speeds, as would my old router and access point system would.

ETA: No pictures of sister or daughter.