I'm pretty sure Verizon locks the bootloader on their phones. I had a S10e and I wasn't able to unlock it.It may be the same for you.
As far as I know, yes.I have a Xperia 1 VI (XQ-EC72) and bootloader is unlockable.For best results, don't go with the US/UK versions, go global.
Hagar from Xonotic.