So we don't need to download the blueline images that say Verizon and can just use the latest 11.0.0 (RQ3A.210705.001, Jul 2021) image instead?
I haven't done this forever, is there still a need for TWRP if we are sticking with the stock rom, unlocking the bootloader and installing Magisk?
Use the latest blueline 11.0 image - you don't need one that specifically says Verizon. The Verizon only images are merged into the later general blueline images.
TWRP does not work on Android 11. Use adb/fastboot (make sure you have the latest version) per the flashing instructions at https://developers.google.com/android/images