Connecting multiple TFT panels to Arduino Uno via SPI?
Yes, you can. All the SPI pins (MISO, MOSI and SCK) are all shared between the panels. You can even share the D/C and RST signals. The only signal that needs to be separate is the CS pin since this is the pin that identifies which panel is actively receiving commands and data at any one time. Also you don't need to connect up the MISO pin at all, since that is only connected to the SD card slot, not the TFT screen.

So each screen that you add just requires one more pin to be used. One screen uses 5 pins. Two screens use 6 pins. Three screens use 7 pins, etc.

And yes, for this the breakout version would be easier to work with than the shield version.