Can I use the AX1800 (MK63) Nighthawk with my Nighthawk RAX35 to expand my WiFi coverage area?

I own a Netgear Nighthawk AX3000 WiFi Router (RAX35) and wanted to know if I purchase a Dual-band AX1800 3-Pack (MK63) Nighthawk Dual-Band WiFi 6 Mesh System 1.8Gbps Router + 2 Satellites, will it increase the coverage area within my home? I have AT&T Gigabit Fiber Service but the Modem is installed within a metal cabinet for the cable/internet connections. The metal cover and housing seems to cut down on the signal strength. I have a couple of Ethernet runs in the house that if I connect my RAX35 to the hardwired ethernet jack and then connect the AX1800 to the RAX35, would that then provide for additional coverage in the house by putting the two satellites at two opposite ends? I don't want to spend the money for the AX1800 if it won't be compatible with my RAX35. I just need additional wifi coverage for streaming without buffering all the time. Any help would be appreciated. Thanks...